Abstract

233232322, and 0.075-6.0 mol% of a luminescent center compound. By partially replacing gadolinium oxide with gadolinium fluoride, the melting temperature of the glass can be reduced, and the degree of erosion of molten glass to a crucible is reduced, thereby increasing the density of the glass to 6.0 g/cm3 or more. Furthermore, by changing the activation concentration of the luminescent center compound, the scintillation and time performance of the glass are improved. While maintaining high density, the scintillation glass can achieve a light yield exceeding 1000 ph/MeV, with a fast decay component of less than 100 ns.

IPC Classes  ?

• C03C 4/12 - Compositions for glass with special properties for luminescent glassCompositions for glass with special properties for fluorescent glass
• C03C 3/068 - Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths

Abstract

122 to irradiate a surrounding area around the irradiated area of the solid light beam, so as to quench the fluorescence intensity of the surrounding area; and using fluorescence contrast record information of the irradiated area and the surrounding area to form an information record point the size of which is smaller than a diffraction limit. The super-resolution writing and the stimulated emission depletion microscopy technology-based super-resolution reading solve the problems that conventional reading and writing methods cannot break through a diffraction limit, the material transmittance is low, the number of three-dimensional record layers is limited, etc., and the optical storage density and capacity are greatly improved.

IPC Classes  ?

• G11C 11/42 - Digital stores characterised by the use of particular electric or magnetic storage elementsStorage elements therefor using electric elements using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled

Abstract

A high-strength steel laser welding filler, comprising the following components in percentages by weight: 0.05-0.5% of C, 0.1-2% of Cu, 0.2-2.5% of Cr, 0.5-3.5% of Mo, and 2-10% of Ni, with the balance being Fe and inevitable impurities. The filler is used for laser filler welding of hot-formed steel which has an aluminum-containing coating on the surface thereof, can effectively reduce the adverse effect of the aluminum-containing coating on the surface on the strength of a joint, and enables the strength and plasticity of the welded joint, after hot stamping, to reach 90% or more of those of a base material.

IPC Classes  ?

• B23K 26/322 - Bonding taking account of the properties of the material involved involving coated metal parts
• B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
• B23K 103/04 - Steel alloys
• B23K 103/10 - Aluminium or alloys thereof
• B23K 103/16 - Composite materials

Abstract

The curved fork-like grating is provided where curves formed by all points in the same relative positions in respective periods are distributed to be curved and fork-like, so that incident light irradiated on the curved fork-like grating is converted into Bessel-Gaussian light. Such a curved fork-like structure can be achieved by various gratings, such as a metal grating, a dielectric grating, or a metal and dielectric hybrid grating, without affecting their intrinsic characteristics, such as a diffraction efficiency, a use band, a diffraction angle, and a polarization characteristic except that a diffraction light field carries a high-order Bessel phase. Compared with a method for obtaining Bessel-Gaussian light in the prior art, the curved fork-like grating provided by the present invention is simpler in light path and appropriate for a wide band.

IPC Classes  ?

• G02B 27/09 - Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for
• G02B 5/18 - Diffracting gratings
• G02B 27/44 - Grating systemsZone plate systems
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range

Abstract

An apparatus and method for implementing probing of a nanosecond laser-induced damage process on the basis of a pump-probe technique. The apparatus comprises: a first digital delay signal generator, a second digital delay signal generator, a third digital delay signal generator, a probe laser that generates femtosecond or picosecond pulses, a pump laser that generates nanosecond high-energy pulses, a first shutter, a second shutter, a focusing lens, a high-reflectivity mirror, a probe signal receiving apparatus, and a computer. In the method, a pulse signal, which is output by a first digital delay signal generator, is used as a reference to trigger subsequent digital delay signal generators to respectively output frequency conversion signals, so as to implement output pulse delay of a probe laser and a pump laser, and a pump pulse and a probe pulse which are accurately delayed are extracted by means of shutter control. The method reduces hardware requirements, and can avoid requirements for sites, elements, etc., caused by optical path delay while implementing a longer delay, thereby reducing apparatus complexity and application operation difficulty.

IPC Classes  ?

• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

Abstract

An electric resistance welding method for a dissimilar metal joint used for welding a laminated structure, with an outer layer being composed of iron or iron-based alloy, and an inner layer being composed of a metal with a density of less than 5 g/cm3 or a melting point of lower than 800° C. The electric resistance welding method comprises an expulsion stage in which a light metal or low-melting-point metal in the middle of the laminated structure is separated in a splashing mode, so that a connecting structure is directly formed between iron or iron-based alloy layers in a welding interface to complete welding. According to the invention, the formation of brittle intermetallic compounds on the welding interface of the dissimilar joint can be avoided, thereby improving the mechanical properties of the joint and achieving reliable connection between dissimilar metals. The invention further provides a dissimilar metal joint.

IPC Classes  ?

• B23K 11/11 - Spot welding
• F16B 5/08 - Joining sheets or plates to one another or to strips or bars parallel to them by means of welds or the like

Abstract

A high-strength steel laser welding filler, comprising the following components in percentages by weight: 0.05-0.5% of C, 0.1-2% of Cu, 0.2-2.5% of Cr, 0.5-3.5% of Mo, and 2-10% of Ni, with the balance being Fe and inevitable impurities. The filler is used for laser filler welding of hot-formed steel which has an aluminum-containing coating on the surface thereof, can effectively reduce the adverse effect of the aluminum-containing coating on the surface on the strength of a joint, and enables the strength and plasticity of the welded joint, after hot stamping, to reach 90% or more of those of a base material.

IPC Classes  ?

• B23K 26/21 - Bonding by welding

Abstract

A pulse compression electrum optical grating and a manufacturing method therefor, a gold-based binary or multi-component mixture containing silver and/or platinum group elements, or a gold-top silver-bottom thin film which have proper proportions being selected as an electrum optical grating metal layer. The manufacturing method comprises: electrum optical grating feature contour parameter optimizing and electrum film material proportion optimizing. While not degrading optical properties of traditional gold optical gratings, the electrum optical grating broadens the high-diffraction-efficiency wave band of optical gratings, solves or ameliorates the problem of proneness to oxidation of pure-silver optical gratings, and further increases the anti-laser damage threshold value of gold optical gratings; and process parameters thereof can support the manufacturing of optical gratings having meter-scale calibers. The provided optical grating and the related process parameters can support construction of spectrometers, commercial ultrafast lasers and large-scale high-peak-power lasers, thus having great significance for the development of pulse compression optical gratings.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings

Abstract

A curved fork-shaped grating structure, and a curved fork-shaped grating and preparation method therefor. In the curved fork-shaped grating, a curve formed by all points at a same relative position in respective periods thereof is in a curved fork shape distribution, such that an incident beam irradiated on the curved fork-shaped grating is converted into a Bessel Gaussian beam. The curved fork can be implemented by means of various types of grating, such as a metal grating, a dielectric grating or a hybrid metal-dielectric grating; meanwhile, the intrinsic characteristics of the gratings, such as diffraction efficiency, wavebands used, diffraction angle, polarization characteristic etc., are not influenced, only that the diffraction light field carries the high-order Bessel phase. Compared with the method for obtaining the Bessel-Gaussian beam in the prior art, the curved fork-shaped grating provided by the present invention has a simpler light path and is suitable for wide wavebands.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings

Abstract

A method for preparing a reflective curved fork-shaped grating. The grating prepared by the method is a pure-phase grating and can be used for generating perfect optical vortex beams (POV). A high-order Bessel-Gaussian beam is subjected to interference exposure with Gaussian light, wherein the high-order Bessel-Gaussian beam is generated by a reflective pure-phase liquid crystal spatial light modulator (SLM) (5); interference fringes are recorded in a photosensitive material on a substrate, and after development and metal film plating, a reflective curved fork-shaped grating can be prepared. By irradiation using fundamental mode Gaussian light, POV can be obtained in a far field in a first-order diffraction direction or on a focal plane of a lens. Compared with a conventional method using a SLM, the method of obtaining POV by using the reflective curved fork-shaped grating has the following advantages: having a higher damage threshold, a wider working wavelength range, and higher conversion efficiency, having a simple structure, involving low cost, facilitating mass production, having important prospects in generating high-power POV, and being applicable in the fields of optical manipulation, optical processing and the like.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings

Abstract

A spot-welded joint and a manufacturing method therefor. The spot-welded joint comprises a first workpiece (1), a second workpiece (2), and a weld nugget used for fixedly connecting the first workpiece (1) and the second workpiece (2). At least one of the outer surface of the first workpiece (1) and the outer surface of the second workpiece (2) comprises a basic surface and an indentation, wherein the indentation comprises a first surface (111) which is located in the center and protrudes outwards and a second surface (112) which is located on the periphery of the first surface (111) and recessed inwardly, and the maximum distance h1 between the first surface (111) and the basic surface is smaller than the maximum distance h2 between the second surface (112) and the basic surface. The edge welding of the spot-welded joint is firmer, and the center is thinner, so that the generation of surface cracks and the formation of internal defects are reduced, thereby improving the welding spot strength.

IPC Classes  ?

• B23K 11/11 - Spot welding
• B23K 11/10 - Spot weldingStitch welding
• B23K 11/30 - Features relating to electrodes
• B23K 11/00 - Resistance weldingSevering by resistance heating
• B23K 35/00 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting

Abstract

A laser cooling heat sink having a micro-channel structure, comprising a micro-channel heat sink working end (1), a heat-conducting metal filling layer (4), a micro-channel heat dissipation reinforcing end (2), and a heat sink base (3). The micro-channel heat sink working end (1) and the micro-channel heat dissipation reinforcing end (2) are sequentially arranged in the heat sink base (3). The working surface of the micro-channel heat sink working end (1) is attached to the cooling surface of a laser crystal. The heat dissipation surface of the micro-channel heat sink working end (1) is provided with a micro-channel structure, and is connected, by means of the heat-conducting metal filling layer (4), to the micro-channel heat dissipation reinforcing end (2) also provided with a micro-channel structure. The micro-channel structure is formed by pressing staggered heat dissipation ribs (5, 6). The heat sink base (3) is provided with a liquid inlet hole and a liquid outlet hole which are communicated with the micro-channel structure. The heat dissipation ribs (5, 6) arranged in a staggered manner are mutually pressed to form a micro-channel structure, so that the processing controllability is higher, and the processing difficulty is greatly reduced, thereby greatly reducing the precision requirements on processing equipment and reducing the production cost.

IPC Classes  ?

• H01S 3/04 - Arrangements for thermal management
• H01S 3/042 - Arrangements for thermal management for solid state lasers
• F28D 9/00 - Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall

Abstract

22323222222323233. The yttrium aluminosilicate glass provided in the present application has relatively high glass forming capability, good anti-falling performance and good mechanical properties such as Vickers hardness, Mohs hardness and Young modulus.

IPC Classes  ?

• C03C 3/095 - Glass compositions containing silica with 40% to 90% silica by weight containing rare earths
• C03C 3/062 - Glass compositions containing silica with less than 40% silica by weight

Abstract

2323233: 0%-1%. By introducing alkaline earth metal ions and alkali metal ions in a glass system composed of calcium and aluminum, the glass-forming performance of the microcrystalline glass can be effectively improved while high mechanical strength of the microcrystalline glass is maintained, and the glass melting temperature and energy consumption can be reduced.

IPC Classes  ?

• C03C 3/253 - Silica-free oxide glass compositions containing germanium
• C03C 10/16 - Halogen-containing crystalline phase

Abstract

The present invention relates to the field of optical thin films, mainly aims at a nodular defect for reducing an optical thin film damage threshold, and particularly relates to a method for improving a thin film laser damage threshold by removing a spherical crown-shaped bump on the surface of a nodular defect. The method provided by the present invention comprises: using a smooth surface having roughness less than that of a thin film element as a polishing surface; by using a liquid having good wettability, forming a liquid film between the polishing surface and the surface of the thin film, a capillary force generated by the liquid film being the positive pressure acting on the surface of the thin film; and removing the nodular bump on the film surface by means of a friction force during a relative sliding process of the polishing surface and the film surface. The present invention uses a smooth surface and a liquid having good wettability for removing nodular bumps on the surface of a thin film, so that electric field enhancement caused by the nodular defect is reduced, and the laser damage threshold of the thin film element is improved without affecting the spectral performance of the thin film. Compared with an existing method for improving the laser damage threshold of an optical thin film, the present invention has characteristics such as simple operation, low cost, and broad application range.

IPC Classes  ?

• C23C 14/58 - After-treatment
• B24B 1/00 - Processes of grinding or polishingUse of auxiliary equipment in connection with such processes

Abstract

A method for growing long-seed DKDP crystal by two-dimensional motion grows the crystal along the cylindrical surface, and there is no cylinder-cone interface with low optical quality, while avoiding three flow regions which are inevitable in the crystal growth process by rotating crystal method, including incident flow, side flow and wake flow, and easily cause inclusion formation. The long seed crystal moves periodically in the fresh solution, four cylindrical surfaces can achieve reversible shear flow in one cycle, and any point on the cylindrical surface experiences the same hydrodynamic conditions in one movement cycle, so that the solute supply is sufficient and uniform, the growth velocity is improved, and the stability of morphology is ensured. The method facilitates rapid growth of high quality DKDP crystals and provides a better solution for the large-size, high-quality DKDP crystal growth required by the ICF laser device.

IPC Classes  ?

• C30B 7/00 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
• C30B 29/16 - Oxides

Abstract

A welding material piece (100), used for dissimilar metal welding of a first metal plate (200) having a melting point not exceeding 800°C and a second metal plate (300) having a melting point higher than 800°C. A prismatic structure (101) is arranged around the center of the surface of the welding material piece making contact with the first metal plate, such that the prismatic structure can be embedded into the surface of the first metal plate in a welding process. The welding material piece can effectively achieve electric resistance welding connection between dissimilar metal, and improves the joint strength and the welding quality, and is simple in manufacturing and low in cost. The present invention further relates to a material piece conveying system, a welding device, and a welding method.

IPC Classes  ?

• B23K 11/36 - Auxiliary equipment

Abstract

A simultaneous phase-shift point diffraction interferometer and method for detecting wave aberration. The interferometer comprises an ideal spherical wave generation module, an optical system to be measured, an image plane mask, a polarization phase shift module, a two-dimensional polarization imaging photodetector and a data processing unit. Single photodetector is adopted to realize simultaneous detection of more than three phase shift interference patterns, and has the advantages that environmental interference suppression, a flexible optical path, high measurement accuracy, and calibration of system errors of the interferometer may be realized.

IPC Classes  ?

• G01B 9/02 - Interferometers
• G01B 9/02055 - Reduction or prevention of errorsTestingCalibration

Abstract

A three-axis high-optical subdivision grating ruler, which comprises: a dual-frequency polarized parallel light and reference light generation module, non-polarizing beam splitter prisms (2, 5), a combined grating (6), a two-dimensional subdivision prism assembly (10), a two-dimensional grating (11), a heterodyne photoelectric conversion unit module (2000), and a light source driving and signal detection and processing device (30). The dual-frequency polarized parallel light and reference light generation module generates three beams of dual-frequency polarized parallel light. After passing through the non-polarizing beam splitter prism (2) and the combined grating (6), the three beams of dual-frequency polarized parallel light are incident to the two-dimensional subdivision prism assembly (10), are diffracted and reflected back and forth approximately at a Littrow angle between the two-dimensional grating (11) and the two-dimensional subdivision prism assembly (10), are finally subjected to auto-collimation and reflected back, are respectively subjected to beam combination by the combined grating (6), coincide with respective incident light beams, are then reflected by the non-polarizing beam splitter prism (5), are received by the heterodyne photoelectric conversion unit module (2000), and are further detected and processed by the light source driving and signal detection and processing device (30), so as to obtain eight-or-more-times optically subdivided displacement and angle measurements of three axes X/Y/θz of relative motion of the two-dimensional grating (11).

IPC Classes  ?

• G01B 11/02 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness
• G01B 11/26 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes

Abstract

Provided are a resistance welding method for a dissimilar metal joint, and a dissimilar metal joint, welding a laminated structure having an outer layer composed of iron or an iron-based alloy, and an inner layer composed of metal having a density less than 5 g/cm3 or a melting point lower than 800°C. The resistance welding method comprises a spatter stage, the light metal or low-melting-point metal in the middle of the laminated structure being separated in spattering manner in the spatter stage, so that the iron or iron-based alloy layers in the welding interface directly form a connecting structure to complete welding. The present resistance welding method can prevent formation of brittle intermetallic compounds in a dissimilar joint welding interface, improving mechanical properties of the joint and achieving a reliable connection between dissimilar metals.

IPC Classes  ?

• B23K 11/20 - Resistance weldingSevering by resistance heating taking account of the properties of the material to be welded of different metals
• B23K 11/11 - Spot welding

Abstract

A broadband super-Rayleigh speckle correlated imaging spectral camera based on dispersion compensation is provided. The imaging scheme comprises, but is not limited to, a pre-compensation scheme, a post-compensation scheme, or a pre-post joint compensation scheme. The device comprises components such as a pre-imaging module, a light filter, a phase modulation module, a relay imaging module, an area array detector, and a computer. According to the present invention, the super-Rayleigh speckle modulation in a broadband is realized by matchining the dispersion characteristic of the pre-imaging module or the relay imaging module with the phase modulation module, which is applied to the correlated imaging spectral camera, so that the imaging quality of the correlated imaging spectral camera at a low signal-to-noise ratio is improved.

IPC Classes  ?

• G01J 3/28 - Investigating the spectrum
• G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details
• G01J 3/433 - Modulation spectrometryDerivative spectrometry

Abstract

Method for simultaneously compensating pupil coordinate distortion and shear amount change in a process of wavefront reconstruction in grating transverse shear interference. Where a wavefront is diffracted by a grating, the shapes and light paths of the diffracted wavefronts of all the orders are different, so that on one hand, a coordinate system detected by a detector plane is distorted relative to a pupil coordinate system, and on the other hand, a shear amount changes along with a coordinate position.

IPC Classes  ?

• G01B 9/02098 - Shearing interferometers

Abstract

A device and method for phase imaging and element detection based on wavefront modulation are provided to overcome the disadvantages of an existing interferometry such as twin image elimination, limit resolution, under-sampling wavefront measurement, and multi-modal measurement. From the perspective of light field encoding, the accurate measurement to a complex amplitude of a light field to be measured is completely achieved by the iterative calculation, and at the same time, a twin image problem may be effectively eliminated, and it has the multi-modal (multi-wavelength) reconstruction ability. Theoretically, it is able to reach the diffraction limit resolution, may be widely used in phase imaging, optical element surface-type detection, polarization distribution measurement and the like, and it has a wide range of applications.

IPC Classes  ?

• G01J 9/00 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength
• G02B 27/14 - Beam splitting or combining systems operating by reflection only
• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising
• G02B 27/09 - Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for
• G02B 27/12 - Beam splitting or combining systems operating by refraction only
• G02B 6/28 - Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
• H04N 5/225 - Television cameras
• H04N 5/235 - Circuitry for compensating for variation in the brightness of the object

Abstract

A broadband super-Rayleigh speckle correlated imaging spectral camera based on dispersion compensation. Imaging solutions comprise but are not limited to the following several imaging solutions: a pre-compensation solution, a post-compensation solution or a combined pre- and post-compensation solution. The broadband super-Rayleigh speckle correlated imaging spectral camera based on dispersion compensation comprises elements such as a front-facing imaging module (1), a bandpass filter (2), a phase modulation module, a relay imaging module (4), an area array detector (5), and a computer (6).According to the broadband super-Rayleigh speckle correlated imaging spectral camera based on dispersion compensation, super-Rayleigh speckle modulation over a broadband is implemented by using the dispersion characteristics of the front-facing imaging module (1) or the relay imaging module (4) in conjunction with the phase modulation module, and this method is applied to a correlated imaging spectral camera, thereby improving the imaging quality of the correlated imaging spectral camera in a low signal-to-noise ratio.

IPC Classes  ?

• G01J 3/28 - Investigating the spectrum
• G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details

Abstract

A multi-channel device and method for measuring the distortion and magnification of objective lens. The multi-channel device for measuring the distortion and magnification of objective lens comprises an illumination system, a reticle stage, a test reticle, a projection objective lens, a wafer stage and a multi-channel image plane sensor, wherein the multi-channel image plane sensor simultaneously measures the image placement shifts between actual image points and nominal image points after a plurality of object plane test marks are imaged by the projection objective lens, and calculates the distortion and magnification errors of the objective lens by fitting, which shortens the measurement time, eliminates the influence of wafer stage errors on the measurement accuracy and improves the measurement accuracy.

IPC Classes  ?

• G03F 7/20 - ExposureApparatus therefor
• G03F 1/44 - Testing or measuring features, e.g. grid patterns, focus monitors, sawtooth scales or notched scales
• G03F 1/42 - Alignment or registration features, e.g. alignment marks on the mask substrates

Abstract

−), and —OD group of 16-118 ppm. Irradiation resistance of core rod glass can be effectively improved by sequentially performing pre-treatments, i.e. deuterium loading, pre-irradiation and thermal annealing on a preform core rod. Electron paramagnetic resonance test shows that, under the same radiation condition, the radiation induced color center concentration in a preform core rod treated by the method above is lower than in an untreated core rod by one or more orders of magnitude. The obtained core rod can be used for preparing a radiation-resistant rare earth-doped silica fiber, and has the advantages of high laser slope efficiency, low background loss, being able to be used stably in a vacuum environment for a long time, for example.

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• C03C 25/1065 - Multiple coatings
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

A two-dimensional motion-based growth method for a long-seed DKDP crystal, wherein a two-dimensional motion motor drives a crystal carrier to perform periodic translation on a horizontal plane in a growth solution in a growth tank according to a square motion trajectory. Reversible shear flow can be realized on four cylindrical surfaces after a motion cycle, and any point on the cylindrical surfaces undergoes exactly the same hydrodynamic conditions in one motion cycle, so that the solute supply is both sufficient and uniform, the growth velocity is increased, and the morphological stability is good.

IPC Classes  ?

• C30B 7/00 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
• C30B 29/14 - Phosphates

Abstract

An ultrastable laser system is based on a polarization-maintaining optical fiber. The ultrastable laser system comprises a laser device; acousto-optic modulators, a first beam splitter, a polarizer, an optical fiber interferometer comprising a second beam splitter, an optical fiber delay line, a third acousto-optic modulator, and a beam combiner; a beam combiner, a polarization beam splitter, photoelectric detectors, a frequency synthesizer, frequency mixers, a servo feedback circuit and a piezoelectric ceramic. The temperature interference is eliminated based on the characteristic that refractive indexes of a fast axis and a slow axis of the polarization-maintaining optical fiber differently change with a temperature, a vacuum structure can be avoided, and the ultrastable laser system has low cost, small system, simple structure and high signal stability.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/067 - Fibre lasers
• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating

Abstract

Apparatus and method for detecting wavefront aberration of an objective lens, comprising a wavefront detection system, a planar mirror, and a planar mirror adjusting mechanism; the objective lens is placed between planar mirror and wavefront detection system; planar mirror is positioned at focal point of the objective lens. A test wavefront emitted by wavefront detection system passes through the objective lens, gets reflected by the planar mirror, and t passes through the objective lens again; the wavefront detection system receives and detects the test wavefront to derive a phase distribution thereof; an angle of the planar mirror tilts at is adjusted to obtain different return wavefronts; a polynomial for expressing wavefront aberration is selected, and expressions corresponding to all the return wavefronts are calculated; result of fitting the wavefront aberration of the objective lens when expressed by the selected polynomial is derived through fitting with the polynomial.

IPC Classes  ?

• G01B 11/02 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness
• G01M 11/02 - Testing optical properties
• G01B 9/0209 - Low-coherence interferometers
• G02B 5/08 - Mirrors

Abstract

The present application relates to an ocean observation method and system based on accompanying flight of two satellites respectively carrying an interference imaging altimeter and a laser radar. The ocean observation method comprises: an observation step, which is configured to observe, in an operation orbit, an ocean phenomenon by means of a first satellite and a second satellite which perform accompanying flight in the same operation orbit, wherein the first satellite performs ocean surface height observation by means of carrying an interference imaging altimeter, and the second satellite performs atmosphere and ocean profile observation by means of carrying an ocean profile laser radar; and a data processing and transmission step, which is configured to receive, by means of the first satellite, atmosphere and ocean profile observation data sent by the second satellite, and send, to a ground station, the atmosphere and ocean profile observation data and ocean surface height observation data from the first satellite, and which is configured to process, by means of the ground station, the ocean surface height observation data and the atmosphere and ocean profile observation data, so as to obtain an observation result. By means of the present application, the problem of realizing, at a low cost and low risk, the wide-swath and sub-mesoscale observation of an ocean and the remote sensing detection of a near thermocline of the ocean is solved.

IPC Classes  ?

• G01S 17/95 - Lidar systems, specially adapted for specific applications for meteorological use
• G01S 17/90 - Lidar systems, specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
• G01S 7/48 - Details of systems according to groups , , of systems according to group

Abstract

A method for laser powder-filling welding and heat treatment of coated steel, comprising the following steps: selecting evenly mixed manganese-chromium-nickel alloy powder (3); mounting, clamping and fixing two coated steel sheets (4, 5) on a welding workbench; implementing laser powder-filling welding; and performing heat treatment after welding.

IPC Classes  ?

• B23K 26/21 - Bonding by welding
• B23K 26/70 - Auxiliary operations or equipment

Abstract

A device for realizing the splicing of an array fiber and a large-size quartz end cap comprises a carbon dioxide laser, a light splitter, a light beam shaper, a high reflectivity mirror, an image detection module, an array fiber and a carrier thereof, a large-size quartz end cap and a carrier thereof, a stepping motor, a thermodetector, and a computer; a laser beam emitted by the carbon dioxide laser is divided into two light beams through a light splitter, after the two light beams respectively pass through the beam shaper and the high reflectivity mirror, two strip-shaped light spots with uniform power density are integrally formed to heat a splicing face of the large-size quartz end cap, a uniform temperature field of a target splicing area is achieved through indirect heating and heat conduction.

IPC Classes  ?

• G02B 6/255 - Splicing of light guides, e.g. by fusion or bonding

Abstract

A wavefront modulation-based device and method for phase imaging and component detection. In view of the deficiencies of existing interferometry techniques with respect to twin image elimination, limit resolution, undersampling wavefront measurement, and multimodal measurement, a wavefront modulation-based device and method for phase imaging and component detection is provided; from the perspective of light field encoding, the accurate measurement of the complex amplitude of a light field to be measured is completed by means of iterative calculations, and the twin image problem may be effectively eliminated at the same time; and the device has multi-modality (multi-wavelength) reconstruction capabilities, may theoretically achieve diffraction limit resolution, may be widely used in phase imaging, optical component surface shape detection and polarization distribution measurement, and has a wide range of applications.

IPC Classes  ?

• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation
• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
• G01J 9/00 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength

Abstract

A laser welding and heat treatment method for high-strength steel. The method comprises the following steps: selecting a welding paste having an austenite stabilizing element as a filler material; clamping and fixing two high-strength steel plates on a welding workbench; performing laser welding on a region to be welded while conveying the filler material to a weld pool; and placing the welded steel plates in a heating furnace at 850-1100°C for 2-30 min, and then cooling same to room temperature by any cooling means. After heat treatment, a fusion zone of a welded joint has a martensitic microstructure.

IPC Classes  ?

• B23K 26/21 - Bonding by welding
• B23K 26/70 - Auxiliary operations or equipment
• C21D 1/18 - HardeningQuenching with or without subsequent tempering
• C21D 6/00 - Heat treatment of ferrous alloys
• C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for welded joints

Abstract

A six-degree-of-freedom measuring grating scale, comprising: a laser device (1), a beam splitting and collimation module (2, 3, 4), a polarizing light splitter (11), a reflective module (12, 13), an auto-collimation module (14, 15), a measuring grating (16), a linear polarizer (17), six detection units (18-23), and a signal acquisition and processing device (24). A single reading head of the grating scale can achieve six-degree-of-freedom high-precision measurement of a measured object. By means of an effective optical path design, a large-mounting-tolerance optical path structure in which Littrow auto-collimated incidence is performed on the measuring grating can be achieved. The overall structure of the grating scale system is simple and compact, and the grating scale can be manufactured easily, and has low costs.

IPC Classes  ?

• G01B 11/26 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes
• G01B 11/02 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness

Abstract

A mid-frequency error-free machining method under a magneto-rheological polishing magic angle-step includes the following steps: measuring a magneto-rheological removal function, and determining a control accuracy of a machine tool; performing two-dimensional Fourier transform on the removal function, performing compensating filtering on a frequency spectrum based on the control accuracy of the machine tool, and analyzing a corresponding step at the lowest point of an amplitude of the two-dimensional frequency spectrum that undergoes filtering in a direction of a magic angle; planning a grid path under the given step on the basis of adjusting a direction of a machining path or a posture of a magneto-rheological polishing wheel to allow an included angle between the polishing wheel and the path kept to be at the magic angle; and finally, controlling the machining of the machine tool.

IPC Classes  ?

• B24B 1/00 - Processes of grinding or polishingUse of auxiliary equipment in connection with such processes
• B24B 51/00 - Arrangements for automatic control of a series of individual steps in grinding a workpiece

Abstract

A single-beam photothermal measurement apparatus and a measurement method for absorptive defects. The apparatus comprises a common-path-type structure and a non-common-path-type structure. The present invention is simple in optical structure and convenient to align and adjustment. The measurement result is stable, and measurement signal anomalies caused by environmental vibration and sample tilt are avoided. By detecting a power change on the edge of a beam spot, the measurement sensitivity of a system is remarkably improved.

IPC Classes  ?

• G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
• G01N 21/958 - Inspecting transparent materials
• G02B 26/10 - Scanning systems
• G02B 27/14 - Beam splitting or combining systems operating by reflection only
• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising

Abstract

A multi-dimensional spatial positioning system and method for disturbance source. The system includes a distributed-optical fiber sensor, a sensing optical fiber, a coordinate system, a disturbance source to be monitored, a first signal group, and a second signal group. The disturbance source is positioned by combining an array signal processing method with the distributed optical fiber sensor, using different laying manners for the sensing optical fiber and a certain number of flexibly selected sensing units distributed a certain distance from each other along a line, and combining with a special signal processing method, thereby realizing a function of being capable of monitoring multi-dimensional spatial position information of the disturbance source in real time in both short and long distances.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

Provided are a three-dimensional multi-viewpoint display apparatus and manufacturing method; the three-dimensional multi-viewpoint display apparatus comprises, in sequence, a display screen (1), a three-dimensional multi-viewpoint display grating, and a multi-viewpoint three-dimensional window (4); the three-dimensional multi-viewpoint display grating consists of a turning grating (2) of a first layer and a pixel grating of a second layer (3); the turning grating (2) being a tilting grating, a blazed grating, or a continuous grayscale grating; the pixel grating (3) corresponds to each pixel on the display screen (1), and diffracts the red, green, and blue light from each pixel of the display screen (1) to the multi-viewpoint area of the multi-viewpoint three-dimensional window (4), achieving three-dimensional multi-viewpoint display. The three-dimensional multi-viewpoint display double-layer grating can be produced and replicated in large volumes, and can be widely used in the field of three-dimensional display screens.

IPC Classes  ?

• G02B 30/34 - Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
• G02F 1/1335 - Structural association of cells with optical devices, e.g. polarisers or reflectors
• G02B 5/18 - Diffracting gratings

Abstract

Provided are an integrated super-resolution laser direct-writing device and a direct-writing method. The integrated super-resolution laser direct-writing device includes a first continuous laser, a first optical fiber coupler, a mono-mode optical fiber, a second continuous laser, a second optical fiber coupler, a first annular photonic crystal fiber, a bifurcated optical fiber, a lens group, a first dichroic mirror, an LED light source, a lens, a second dichroic mirror, an auto-focusing module, a third dichroic mirror, a third optical fiber coupler, a square-law graded index fiber, a nanometer displacement table, a second lens, a CMOS camera and a control system. According to the present invention, an original large direct-writing device based on a free optical path can achieve optical fibers of key devices and integration of systems and can be better applied to the field of laser direct-writing.

IPC Classes  ?

• G03F 7/20 - ExposureApparatus therefor

Abstract

A three-axis grating ruler, comprising a three-axis measurement light beam generation unit (101), an X-axis measurement light beam detection unit (104), a Y-axis measurement light beam detection unit (103), a Z-axis measurement light beam detection unit (102) and a signal acquisition and processing unit (38). The three-axis measurement light beam generation unit (101) comprises a polarization collimation laser light source (1), a beam splitting two-dimensional diffraction grating (2), a first collimation objective lens (8), a polarization prism assembly (1011), a second collimation objective lens (14) and a measurement two-dimensional diffraction grating (15). The beam splitting two-dimensional diffraction grating (2) and the measurement two-dimensional diffraction grating (15) are in two-dimensional orthogonal symmetry, and each have equal two-dimensional grating pitches. X-axis and Y-axis measurement light beam generation light paths have double optical subdivision and optical difference properties, the precision is high, and the installation tolerance is large; and an optical path of the measurement light beam generation unit and optical paths of the measurement light beam detection units jointly form an integrated three-dimensional displacement measurement homodyne grating interferometer, such that the structure is compact, the cost is low, and Abbe errors and cosine errors caused by the fact that the orthogonality and common intersection points are not met are avoided.

IPC Classes  ?

• G01B 11/02 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness

Abstract

A picometer ruler. The picometer ruler is a picometer-scale metering tool, and is characterized in comprising an interference light field generation mechanism, a precision adjustment platform, and a detector which is in a transmission direction or a reflection direction of an interference light field, wherein the detector is used for recording an interference signal of the interference light field when the motion of the precision adjustment platform is measured, so as to realize picometer metering. The core of the picometer ruler is realizing metering and measurement by means of a picometer-structured light field. The picometer ruler can be used in scenarios, such as picometer photoetching, picometer measurement, picometer imaging and picometer cameras, that need picometer measurement, and is an essential metering tool for developing emerging disciplines such as picometer optical technology, picometer femtosecond optics, picometer attosecond optics, picometer physics, and picometer-scale light-matter interaction.

IPC Classes  ?

• G01B 9/02 - Interferometers

Abstract

st-order diffracted beam is exactly extracted through phase shifting method, and the original wavefront is obtained by carrying out reconstruction algorithm according to a shear ratio of 2s, such that the accuracy of wavefront measurement of the optical imaging system under test is improved, wherein s is the shear ratio of the grating shearing interferometer.

IPC Classes  ?

• G01J 9/02 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength by interferometric methods
• G01B 9/02098 - Shearing interferometers
• G01J 9/00 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength

Abstract

A dichroic mirror based on a sandwich-like structure interface and a composite material and a preparation method therefor. The method comprises: simultaneously depositing a material A having a refractive index greater than 1.8 and a material B having an optical band gap greater than 6.0 eV by using electron beam evaporation technology, so as to form a composite material to replace a single high refractive index material in a conventional dichroic mirror film as a high refractive index film layer H, and using a single low refractive index material C as a low refractive index film layer L; by controlling the deposition rates of the material A, material B, and material C, forming a transition interface of a sandwich-like structure between the high refractive index film layer and the low refractive index film layer, the transition interface structure being an A+B gradient material layer and a |A|A+C gradient material layer. In the present invention, the interface between a high refractive index film layer and a low refractive index film layer is designed as a transition interface of a sandwich-like structure, and performances such as an interface binding force of the dichroic mirror and a laser damage threshold can be improved without affecting the spectral performance of a thin film.

IPC Classes  ?

• C23C 14/30 - Vacuum evaporation by wave energy or particle radiation by electron bombardment
• C23C 14/10 - Glass or silica
• C23C 14/08 - Oxides
• C23C 14/54 - Controlling or regulating the coating process

Abstract

A laser tailor welding method of aluminum-silicon coated steel, comprising the following steps: selecting a stainless steel welding wire having a high molybdenum content (6); taking two steel plates (1, 2) having an aluminum-silicon coating (3, 4); implementing laser filler wire tailor welding; and carrying out hot stamping after welding.

IPC Classes  ?

• B23K 26/211 - Bonding by welding with interposition of special material to facilitate connection of the parts
• B23K 26/60 - Preliminary treatment
• B23K 26/70 - Auxiliary operations or equipment

Abstract

A method for laser welding aluminium-silicon coated steel, comprising the following steps: selecting a welding wire having high molybdenum content; acquiring two steel plates (1, 2) having aluminium-silicon coatings (4); carrying out butt-joint laser welding with filler wire; and performing hot stamping after welding. The method does not require the coating to be removed, and aluminium-silicon coated steel can be spliced simply by filling the welding wire. After hot stamping, the welded joint has the same strength and toughness as the base material, thereby improving product quality and production efficiency. The present disclosure also relates to the welding wire used in the method and a welding area formed.

IPC Classes  ?

• B23K 26/21 - Bonding by welding
• B23K 26/08 - Devices involving relative movement between laser beam and workpiece

Abstract

A processing method without intermediate-frequency error under a magnetorheological polishing magic angle-step. The method comprises the steps of: firstly, performing measurement to obtain a magnetorheological removal function, and also determining the control precision of a machine tool; performing a two-dimensional Fourier transform on the removal function, performing compensation filtering on a spectrum on the basis of the control precision of the machine tool, and analyzing a corresponding step of the lowest amplitude point of the filtered two-dimensional spectrum in a magic angle direction; planning a grid path at a given step on the basis of adjusting the direction of a processing path or an attitude of a magnetorheological polishing wheel such that the included angle between the polishing wheel and the path is a magic angle; and finally, controlling the processing of the machine tool. By means of the method, no additional cost is needed; only the included angle between a removal function and a path, and a path step need to be changed to optimal values obtained by means of theoretical analysis; and the amplitude of a trajectory-like intermediate-frequency error can theoretically be far lower than that of other processing noises and thus disappear, such that processing without an intermediate frequency can be realized, and a low-frequency and high-frequency error of an element is not affected.

IPC Classes  ?

• B24B 1/00 - Processes of grinding or polishingUse of auxiliary equipment in connection with such processes

Abstract

An ultra-intense chirped laser pulse stepwise compression device, comprising: a light beam smoothing and initial pre-compression module composed of negative dispersion elements such as a prism pair, a pulse main compression module composed of a grating compressor, etc., and a final compression module composed of spatial and temporal focusing and (or) a self-compression process in a transparent medium sheet. The present invention uses a smoothing function of the pre-compression module on the incident laser spatial intensity modulation, so that the laser spatial intensity modulation is reduced, and the damage of the laser spatial intensity modulation to incident and emergent gratings is reduced, thereby increasing the incident laser energy, and obtaining a stronger laser output at a single stage. In a pulse self-compression process of the final compression module, the spectrum can be further broadened, and the laser pulse can be compressed, so as to obtain a shorter laser pulse output.

IPC Classes  ?

• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
• G02B 27/44 - Grating systemsZone plate systems
• G02B 27/09 - Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for

Abstract

A high laser damage threshold reflective optically addressed liquid crystal spatial light modulator for shaping 1053 nm linearly polarized light beams, comprising a computer-controlled LCoS electrical addressable spatial light modulator, polarization beam splitter, and polarizer, Liquid crystal cell, analyzer, AC power supply, where the liquid crystal cell comprises a transparent conductive film antireflection film layer, a transparent conductive film base layer, a first transparent conductive layer, a liquid crystal alignment layer, a liquid crystal layer, an alignment element, a reflective film layer, a light guide layer, and a second transparent conductive layer. By changing the transparent conductive layer material of the light-transmitting part of the liquid crystal cell from ITO to gallium nitride material, the damage threshold of the high-energy laser is improved, which facilitates application of beam shaping in high-power laser devices.

IPC Classes  ?

• G02F 1/1333 - Constructional arrangements
• G02F 1/1362 - Active matrix addressed cells
• G02F 1/1335 - Structural association of cells with optical devices, e.g. polarisers or reflectors
• G02F 1/1343 - Electrodes
• G02F 1/1337 - Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

Abstract

An absorptive defect single-beam photothermal measurement device and measurement method. The device comprises common-optical-path and non-common-optical-path structures. According to the present invention, the optical path structure is simple and it is convenient to install and debug. The measurement result is stable, and a measurement signal anomaly caused by environmental vibration and sample inclination is avoided. By detecting power change of a light beam at the edge of a light spot, system measurement sensitivity is significantly improved.

IPC Classes  ?

• G01N 21/95 - Investigating the presence of flaws, defects or contamination characterised by the material or shape of the object to be examined
• G01N 21/896 - Optical defects in or on transparent materials, e.g. distortion, surface flaws
• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated

Abstract

A laser radar system apparatus for the multi-wavelength measurement of the atmospheric carbon dioxide concentration and a vertical aerosol profile, including: a laser transmitting unit; a dual-pulse laser capable of simultaneously transmitting laser having three wavelengths, i.e., 1572 nm, 1064 nm, and 532 nm; a transmitting beam expander; a receiving telescope system; a visual axis monitoring module; a photoelectric detection unit; and a data acquisition and processing unit. The laser that simultaneously outputs laser having three wavelengths is used in a laser radar system, and an optical differential absorption method and a high spectral resolution detection method are used, such that the atmospheric carbon dioxide concentration and the vertical aerosol profile can be measured simultaneously and high-precision aerosol monitoring is implemented during the high-precision obtaining of the concentration of the greenhouse gas carbon dioxide.

IPC Classes  ?

• G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
• G01N 21/25 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• G01N 21/85 - Investigating moving fluids or granular solids
• G01S 17/95 - Lidar systems, specially adapted for specific applications for meteorological use

Abstract

An apparatus and method herein efficiently couple spatial light to optical fiber light for achieving stability of an optical axis without a position sensor. The basic concept of the method includes: first, obtaining, according to a theoretical coupling efficiency model, a model parameter by means of fitting calculation; second, using a four-point tracking algorithm to calculate an optical fiber nutation trajectory according to the optical fiber nutation principle; and finally, using the nutation trajectory to calculate the position deviation of a central point. The optical axis is ensured to be stable by correcting the position deviation, and the high coupling efficiency remains. The method is used for the stability of the optical axis in a space coherent laser communication DPSK link. The high efficiency coupling is a key technology of long-distance, high bit rate transmission in space laser communication, and is significant in the development of inter-satellite optical communications.

IPC Classes  ?

• G02B 6/42 - Coupling light guides with opto-electronic elements

Abstract

A laser driving device and a method for enabling a uniform light field, wherein the laser driving device is a high-power laser driving device that enables a uniform light field on the basis of a narrow-band low-spatial-coherence light and is provided for laser fusion. The narrow-band low-spatial-coherence light is configured as a seed of the laser driving device, an amplification and transmission unit amplifies the seed, a frequency conversion unit converts a frequency of the laser, and a focusing component is configured for laser focusing and uniform illumination.

IPC Classes  ?

• H01S 3/08 - Construction or shape of optical resonators or components thereof
• H01S 3/06 - Construction or shape of active medium
• H01S 3/109 - Frequency multiplication, e.g. harmonic generation
• H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light

Abstract

A distributed fiber-optic acoustic sensing system and a signal processing method. The distributed fiber-optic acoustic sensing system is based on a high spatial resolution distributed fiber-optic acoustic sensor. The interval between adjacent sensing units is centimeter or millimeter level. Through specific digital signal processing, signal enhancement can be realized, noise in the system and environment are suppressed, at the same time, problems such as interference fading is solved, and the sensor signal-to-noise ratio of subunits can be increased by two to three orders of magnitude. Each subunit can serve as an independent high-sensitivity sensor for sensing. The multiple subunits can form one or more new sensor arrays. The azimuth estimation and spatial orientation of signal sources can be realized by the array signal processing method.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
• G01D 5/353 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

5: 1-5 mol %, respectively. In the preparation method for the photodarkening-resistant ytterbium-doped quartz optical fiber, a sol-gel method and an improved chemical vapor deposition method are combined. By using the molecular-level doping uniformity and the low preparation loss thereof respectively, ytterbium ions, aluminum ions and phosphorus ions are effectively doped in a quartz matrix, thereby effectively solving the problems in the optical fiber of high loss, photodarkening caused by cluster or the like, and a central refractive index dip.

IPC Classes  ?

• C03C 13/04 - Fibre optics, e.g. core and clad fibre compositions
• C03B 37/018 - Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means by glass deposition on a glass substrate, e.g. by chemical vapour deposition
• C03B 37/025 - Manufacture of glass fibres or filaments by drawing or extruding from reheated softened tubes, rods, fibres or filaments
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

A distributed optical fiber acoustic sensing system. On the basis of a distributed optical fiber acoustic sensor having high spatial resolution, the interval between adjacent sensing units is a centimeter or millimeter level; by means of specific digital signal processing, signal enhancement can be realized and noise in the system and an environment can be suppressed; and meanwhile, the problems of interference fading, etc. are solved, and the signal-to-noise ratio of the sensor of a subunit thus can be improved by two to three magnitudes. The various sub-units can be used as independent high-sensitivity sensors for sensing, and a plurality of sub-units further can constitute one or more new sensing arrays to realize azimuth angle estimation and space positioning of a signal source by means of an array signal processing method. The system can solve the problems of interference fading and limited signal-to-noise ratio of distributed optical fiber sensors, and can construct a high signal-to-noise ratio sensor array without changing an optical fiber structure, thus achieving azimuth angle estimation and space positioning of a signal source and having important significance in the fields of ocean underwater acoustic detection, oil and gas exploration, etc. Further disclosed is a signal processing method for the distributed optical fiber acoustic sensing system.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

A light intensity fluctuation-insensitive projection objective wave aberration detection device and a detection method thereof, comprising a light source and illumination system, an object plane marking plate, an object plane displacement table, a tested projection objective, an image plane marking plate, a two-dimensional photosensor, an image plane displacement table and a control processing unit; the object plane marking plate and the image plane marking plate are provided with grating marks for shear interference test and marks for light intensity test, the shear interferograms and the light intensity information are simultaneously received through the two-dimensional photosensor, the light intensity fluctuation error corresponding to each phase-shifting interferogram is corrected through the light intensity information, improving the detection precision, reducing the complexity and the cost of the system, and improving the detection speed.

IPC Classes  ?

• G01J 9/02 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength by interferometric methods
• G01B 9/02 - Interferometers
• G01M 11/02 - Testing optical properties
• G03F 7/20 - ExposureApparatus therefor

Abstract

A single-shot Fresnel non-coherent correlation digital holographic device based on a polarization-oriented planar lens, comprising: A polarization-oriented planar lens (1) for wavefront modulation and beam splitting, a focusing element (2), a half-wave plate (3) with a small hole and a polarization imaging camera (4). Incident light passes through the polarization-oriented planar lens (1) and the focusing element (2) and is divided into two beams with different polarizations, that is, focused and parallel or focused and divergent beams, wherein the focused beam passes through the small hole of the half-wave plate (3), the parallel or divergent beam passes through the half-wave plate (3), so as to make the polarization of the two beams consistent behind pass through the half-wave plate (3).

IPC Classes  ?

• G03H 1/04 - Processes or apparatus for producing holograms
• G03H 1/06 - Processes or apparatus for producing holograms using incoherent light
• G03H 1/22 - Processes or apparatus for obtaining an optical image from holograms

Abstract

A pico-microscope, comprising a picometer illumination light field generation mechanism. A picometer-scale optical probe output by the mechanism illuminates a measurement object (40), such that picometer-scale information of the measurement object is obtained using a picometer microscopic imaging lens (50) and a picometer microscopic detector (60). The invention facilitates the developments of picometer photoetching, picometer measurement, and picometer-scale nonlinear optical techniques, proposes research directions for emerging disciplines such as picometer femtosecond optics and picometer attosecond optics, and can be widely applied to various fields such as semiconductor photoetching, picometer physics, and interaction of light and matter in the picometer scale.

IPC Classes  ?

• G01B 11/00 - Measuring arrangements characterised by the use of optical techniques
• G02B 21/06 - Means for illuminating specimen
• G02B 5/18 - Diffracting gratings

Abstract

A resistance spot welding electrode cap contains a groove at the center of the welding contact interface. During welding, because of the groove, the area of contact between the electrode cap and a metal workpiece to be soldered is reduced. In the initial stage, the overall heat generation is concentrated on the outer ring of the weld point and heat dissipation becomes slower, helping a weld nugget to form from the outside to the inside. Due to the presence of the groove, the metal workpiece expands toward the groove at the center of the electrode, thereby increasing the size of the weld nugget and reducing splash and deformation. In comparison with conventional electrode caps, the welding current required to form weld points of the same size is lower, saving on electricity costs, and weld points obtained using the same current have higher strength and stability with fewer welding defects.

IPC Classes  ?

• B23K 35/02 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
• B23K 11/11 - Spot welding
• B23K 11/30 - Features relating to electrodes
• B23K 11/16 - Resistance weldingSevering by resistance heating taking account of the properties of the material to be welded

Abstract

A pyramidal growth method for long-seed KDP-type crystal. In the growth method provided by the present invention, the lower end of the long-seed crystal is restricted by a lower tray, and the upper end is free to grow into a pyramidal. At the same time, the four prismatic faces at two directions of [100] and [010] can grow, avoiding growth stress problem during crystal growth, and all cut optical elements have high optical quality. Because the growth process is that four prismatic faces with highly similar growth environments grow at the same time and stirring is applied by blade-like stirring paddles during the crystal growth process, the cut optical elements have high optical uniformity.

IPC Classes  ?

• C30B 7/08 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by cooling of the solution
• G02F 1/35 - Non-linear optics
• C30B 29/14 - Phosphates
• G02F 1/355 - Non-linear optics characterised by the materials used

Abstract

A radial servo control device for a super-resolution optical disc includes an excitation light source, a servo light source, an integrated optical path, focusing units, a servo light detecting unit and a drive control unit; the drive control unit presets N detection error reference values with respect to each guide layer trench irradiated by servo light, and controls corresponding positions of the focusing units in N data tracks below each guide layer trench according to a comparison result between a detection result of servo reflected light and the detection error reference values. The device is applicable to a variety of super-resolution optical discs on the basis of stimulated radiation loss microscopy technology, a two-photon absorption technology, and the like, and achieves accurate radial servo control of super-resolution data tracks (<100 nm) without reducing the wavelength of servo light and the width of guide layer trenches.

IPC Classes  ?

• G11B 7/09 - Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
• G11B 7/08 - Disposition or mounting of heads or light sources relatively to record carriers
• G11B 7/085 - Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position.

Abstract

A metasurface sparse aperture lens (101), comprising a plurality of sub-lenses (102) arranged in a certain sequence; each sub-lens (102) comprises a plurality of microstructures (103) and a substrate (104) supporting the microstructures (103), and all of the sub-lenses (102) jointly form a metasurface sparse aperture lens (101). Phase information corresponding to the metasurface sparse aperture lens (101) may be determined by the wavelength of incident light and the focal length of the lens. By using sparse aperture technology, the same spatial resolution as a large-aperture optical system may be obtained by means of an array system of the sub-lenses (102), thereby reducing the difficulty of preparation and processing costs of a large-aperture super lens (101). The present invention has high application value in the miniaturization and integration of microscopic imaging systems and endoscopic imaging systems and like aspects.

IPC Classes  ?

• G02B 1/00 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements
• G02B 3/00 - Simple or compound lenses

Abstract

A picometer optical comb and a device and a method for generating the same, wherein the picometer optical comb is a special grating with continuously variable widths of adjacent grating lines, wherein the width of each grating line is different from that of the adjacent grating line by a fixed difference in the magnitude of picometer to nanometer. The picometer optical comb provides a reference for picometer measurement. The picometer optical comb can generate a diffraction optical field distribution different from that of a traditional grating, which brings a new diffraction effect, achieves new diffraction optical functions, and provides tools such as picometer photolithography, picometer measurement, picometer imaging and the like. The picometer optical comb plays an important role in the fields of semiconductor photolithography, life science, interaction of light and substances in picometer scale.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings
• G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference
• G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfacesMaterials therefor, e.g. comprising photoresistsApparatus specially adapted therefor

Abstract

Laser ablation processing method for debris-free and efficient removal of materials comprises the step of using a refrigeration device to condense the water vapor and form a thin frost layer on the materials at temperatures below the freezing point. The residual debris produced during the ablation process deposits on the frost layer that covers the material, which is easily removed when the frost layer melts. At the same time, the frost layer in the laser irradiation area melts to a liquid layer, which can effectively reduce the deposition of debris on the inner wall of the groove and thus improve the efficiency and quality of laser ablation. The method is applicable to debris-free laser processing on an arbitrary curved surface.

IPC Classes  ?

• B23K 26/16 - Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece
• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• B23K 26/70 - Auxiliary operations or equipment
• B23K 26/36 - Removing material
• B23K 26/38 - Removing material by boring or cutting
• B23K 103/00 - Materials to be soldered, welded or cut
• G01N 1/42 - Low-temperature sample treatment, e.g. cryofixation

Abstract

A radiation-resistant laser optical fiber preform core rod and a preparation method therefor. Specifically, provided is a radiation-resistant laser optical fiber preform core rod. Said core rod at least comprises one type of activated ion Yb 3+or Er 3+and one or more types of co-doped ion Al 3+, P 5+, Ge 4+, Ce 3+or F -, and -OD group of 16-118 ppm. Also provided is a preparation method for the radiation-resistant laser optical fiber preform core rod, and the irradiation resistance of core rod glass can be effectively improved by sequentially performing pre-treatments, i.e. deuterium carrying, pre-irradiation and thermal annealing on a preform core rod. The electron paramagnetic resonance test shows that, under the same radiation condition, the radiation induced color center concentration in a preform core rod treated by the method above is lower than the radiation induced color center concentration in an untreated core rod by one or more orders of magnitude. The obtained core rod can be used for preparing a radiation-resistant rare earth-doped quartz optical fiber, and has the advantages of high laser slope efficiency, low background loss, being able to be used stably in a vacuum environment for a long time, etc.

IPC Classes  ?

• C03C 13/04 - Fibre optics, e.g. core and clad fibre compositions
• C03B 37/018 - Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means by glass deposition on a glass substrate, e.g. by chemical vapour deposition
• C03B 37/016 - Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means by a liquid phase reaction process, e.g. through a gel phase
• C03B 37/025 - Manufacture of glass fibres or filaments by drawing or extruding from reheated softened tubes, rods, fibres or filaments

Abstract

Projection objective wave-front aberration detecting device and a detecting method thereof, wherein the projection objective wave-front aberration detecting device comprises a light source and illuminating system, an object plane grating, an object plane displacement stage, a measured projection objective, an image plane grating, a two-dimensional photoelectric sensor, an image plane displacement stage and a control processing unit. According to the invention, by controlling the length of the object plane grating line, or the periodic structure of the object plane grating perpendicular to the shearing diffraction direction, or the object plane grating to adopt a sinusoidal grating, or the image plane grating to adopt an amplitude-phase hybrid grating, the complexity of an interference field is reduced, and the wave-front aberration detection speed and precision are improved, and the precision and speed of in-situ wave-front aberration detection can be improved.

IPC Classes  ?

• G03F 7/20 - ExposureApparatus therefor
• G01J 9/02 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength by interferometric methods

Abstract

A surface defect measuring apparatus and method by microscopic scattering polarization imaging is provided. The apparatus mainly comprises a laser, a first converging lens, a rotary diffuser, a second converging lens, a diaphragm, a third converging lens, a pinhole, a fourth converging lens, a polarizer, a half-wave plate, a polarizing beam splitter, an X-Y translation stage, a sample, a microscope lens, a quarter-wave plate, a micro-polarizer array, a camera and a computer. The micro-polarizer array is adopted to realize real-time microscopic scattering polarization imaging of the surface defects; a polarization-degree image is calculated to improve the sensitivity for detecting the surface defects of the ultra-smooth element, and the effective detection of the surface defects of a high-reflective coating element is also realized, and the requirement for rapid detection of the surface defects of a meter-scale large-aperture ultra-smooth element can be met.

IPC Classes  ?

• G01N 21/21 - Polarisation-affecting properties
• G01N 21/49 - Scattering, i.e. diffuse reflection within a body or fluid
• G01N 21/88 - Investigating the presence of flaws, defects or contamination
• G02B 21/08 - Condensers
• G02B 21/00 - Microscopes

Abstract

A microscopic scattering polarization imaging surface defect measuring device and a measuring method. The device mainly comprises a laser (1), a first converging lens (2), a rotating diffuser (3), a second converging lens (4), an optical stop (5), a third converging lens (6), a pinhole (7), a fourth converging lens (8), a polarizer (9), a half-wave plate (10), a polarizing beam splitter (11), an X-Y displacement platform (12), a sample (13), a microscope lens (14), a quarter-wave plate (15), a micro polarizer array (16), a camera (17), and a computer (18). The device implements real-time microscopic scattering polarization imaging of surface defects by using a micro polarizer array (16). By calculating a degree-of-polarization image, the detection sensitivity of the surface defects of ultra-smooth elements is improved, the surface defects of high-reflection film elements are effectively detected, and the requirements for rapid detection of the surface defects of meter-scale large-diameter ultra-smooth elements can be satisfied.

IPC Classes  ?

• G01N 21/88 - Investigating the presence of flaws, defects or contamination

Abstract

Disclosed are a non-contact optical fiber surface tension loading measurement device and measurement method. The device comprises a left optical fiber clamp (1), a right optical fiber clamp (2), a left optical fiber pressing block (3), a right optical fiber pressing block (4), a tension transmission mechanism (5), a rigid connection rod (6), a tension sensor (7), a tension measurement and control unit (8), a left bottom plate (9) and a linear displacement table (10). According to the device and the method, real-time changes in the surface tension of an optical fiber can be rapidly sensed, and the surface tension of the optical fiber can be precisely measured; meanwhile, whether the optical fiber (11) is bent or stretched can be indicated by means of a value obtained by calculation; according to the parameters, the movement of the linear displacement table (10) may be used to stretch or compress the surface tension of the optical fiber, and the surface tension of the optical fiber is controlled and kept balanced, and this has an important application value for device preparation of the optical fiber (11), an optical fiber beam combiner, a splitter and the like. The present invention has an important application value for loading specified tensions during the preparation of high-power optical fiber devices.

IPC Classes  ?

• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Abstract

A picometer optical comb (107), and a manufacturing device and manufacturing method for the picometer optical comb (107). The picometer optical comb (107) is a special optical grating of which the slot widths of adjacent gate lines are continuously variable, wherein the width of each gate slot differs from the width of the adjacent gate slot by a fixed difference value, such as Δd that may be from a picometer scale to a nanometer scale. The picometer optical comb (107) provides a datum for picometer measurement. The picometer optical comb generates a diffractive light field distribution different from the traditional optical grating, so that a new diffraction effect and a new diffraction optical function are achieved and tools for picometer photoetching, picometer measurement, picometer imaging and the like are provided; thus the picometer optical comb (107) would play an important role in multiple fields of semiconductor photoetching, bioscience, light-matter interaction in the picometer scale and the like.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings
• G03F 7/20 - ExposureApparatus therefor

Abstract

A cutting tool and a method for maintaining a welding electrode having a central depression. The cutting tool comprises a main body (1) and cutting components (2). The cutting components (2) are disposed in the main body (1) and comprise one or more cutting blades (21, 22). The cutting blades (21, 22) are distributed radially around the central axis of the main body at equal intervals. The cutting blades (21, 22) partition the main body into a plurality of cutting cavities (80a, 80b, 80c, 80d). Two cutting cavities are formed by the axial outer side surfaces of two ends of each cutting blade and the main body. At least one axial outer side surface of each cutting blade is provided with a cutting edge (3400). A protrusion is provided on the middle of each cutting edge. The axial projection shape of the protrusion is the same as the cross-sectional shape of the central depression of a welding electrode. The cutting tool can perform maintenance accurately, quickly and regularly to restore the original welding surface shape of the welding electrode having a central depression, thereby keeping a high welding quality and ensuring the normal and orderly progress of production activities.

IPC Classes  ?

• B23K 11/30 - Features relating to electrodes
• B23B 5/16 - Turning-machines or devices specially adapted for particular workAccessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes

Abstract

Provided is a method for single-cone growth of long seed crystal for KDP-type crystal; in the growth method provided by the present invention, the lower end of a long seed crystal is restricted by a lower tray, and the upper end grows freely into a cone, while at the same time, four cylinders in the two directions of [100] and [010] can grow; there is no problem of growth stress during the process of crystal growth, and all cut optical components have high optical quality. The growth process is the simultaneous growth of four cylinders having highly similar growth environments, and stirring is performed by means of a blade-shaped stirring paddle during the process of crystal growth, therefore the cut optical components have high optical uniformity. Because of the uniqueness of the cutting angle of KDP crystal frequency tripled components, the crystal grown using the present invention has high cutting efficiency when cutting a frequency tripled component; furthermore, the area of the largest frequency tripled component that can be cut can be known in advance by means of the horizontal size of the grown crystal.

IPC Classes  ?

• C30B 7/08 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by cooling of the solution
• C30B 29/14 - Phosphates

Abstract

A laser welding method. The laser energy of multiple laser beams (21, 22) acts on the surface of an overlap joint material combination for a period of time to melt the material, and a weld joint (3) is formed after cooling and solidification, so as to achieve material connection. During the action, the laser beams remain unchanged in position or are moved arbitrarily within a circle having a diameter of 15 millimeters to obtain a large-size welding spot. The shape of the weld joint formed is a circular, elliptical, or arc-shaped contour. The number of the laser beams varies from 2 to 10, the laser beam spots may be in the shape of dots, annuli, polygons, or short lines, the diameter of the focused spot varies from 0.05 to 10 millimeters, the laser power varies from 0.1 to 50 kilowatts, the energy of the laser beams is output continuously or in the form of pulse, and the action duration ranges from 0.1 second to 10 seconds.

IPC Classes  ?

• B23K 26/22 - Spot welding
• B23K 26/067 - Dividing the beam into multiple beams, e.g. multi-focusing

Abstract

A method for wavefront measurement of optical imaging system based on grating shearing interferometry, the grating shearing interferometer comprising: a light source and illumination system, an optical imaging system to be tested, a one-dimensional diffraction grating plate, a two-dimensional diffraction grating plate, a two-dimensional photoelectric sensor and a computing unit. The one-dimensional diffraction grating plate and the two-dimensional diffraction grating plate are respectively placed on the object side and the image side of the optical imaging system to be tested. By collecting N sets of interferograms with a phase-shifting interval (where, s is the shear ratio of the grating shearing interferometer), combined with a certain phase retrieval algorithm, the influence of all high-order diffraction beams on the phase retrieval accuracy is eliminated, and finally the wavefront measurement accuracy for the optical imaging system is improved.

IPC Classes  ?

• G01B 9/02 - Interferometers
• G01J 9/02 - Measuring optical phase differenceDetermining degree of coherenceMeasuring optical wavelength by interferometric methods
• G01M 11/02 - Testing optical properties

Abstract

Method for detecting wavefront aberration for optical imaging system based on grating shearing interferometer, the grating shearing interferometer system comprising a light source and illumination system, an optical imaging system to be tested, a one-dimensional diffraction grating plate, a two-dimensional diffraction grating plate, a two-dimensional photoelectric sensor, and a computing unit. The one-dimensional and two-dimensional diffraction grating plates are respectively placed on the object plane and the image plane of the optical imaging system to be tested. By collecting interferograms with phase-shifting amounts of 0, π/2, π, 3π/2 and N sets of α, π-α, 2π-α (where, s is the shear ratio of the grating shearing interferometer system), combined with a certain phase retrieval algorithm, the influence of all high-order diffraction beams on the phase retrieval accuracy is eliminated, and finally the detection accuracy of wavefront aberration for the imaging system to be tested is improved.

IPC Classes  ?

• G01B 9/02 - Interferometers
• G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details
• G01J 3/10 - Arrangements of light sources specially adapted for spectrometry or colorimetry
• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating

Abstract

A good-orientation, low-drift micro-movement subassembly for angle adjustment as a precise driving screw for angle adjustment, comprising a slotted knurling handle, a turnbuckle and a central cylindrical shaft. The invention is precise for linear displacement, good orientation, low-drift, stable and reliable adjustment, which can be used for a variety of precision-oriented, small drift, precision micro-angle adjustment of the drive screw.

IPC Classes  ?

• F16H 25/20 - Screw mechanisms
• F16H 57/04 - Features relating to lubrication or cooling

Abstract

Provided is a signal processing method based on a distributed fiber-optic acoustic sensor; in said method, spatial position information of a signal source is obtained by means of pre-processing an acoustic field signal obtained by a sensing unit; then signal processing is performed on the described information, effectively suppressing system random noise introduced by the distributed fiber-optic acoustic sensing system itself, increasing system sensitivity, while also having the ability to enhance or suppress specific incoming and specific spatial position signals, enabling directional and fixed-point detection of perturbation signals. The present invention has advantages such as simple implementation, fast processing speed, strong interference-resistance capability, and obvious improvement of signal-to-noise ratio; further improves the ability of existing sensing systems to monitor target interference signals in a complex operating environment; is suitable for use in railway safety, oil and gas pipeline monitoring, perimeter security, and the like; and has great significance.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

A single shot autocorrelator for measuring duration of an ultrashort laser pulse in the far field, having a beam splitter to form two beams from an input ultrashort pulse: the reflected beam is firstly reflected by two mirrors mounted on a translation stage for adjusting time delay and subsequently a third mirror, and after focused by a spherical convex lens, enters a naturally grown strontium barium niobate crystal along the crystal z axis; the transmitted beam is firstly focused by a spherical convex lens, and after reflected by two mirrors, enters the crystal along the crystal z axis from opposite direction. The crystal is in the common focal regions of two spherical convex lenses and generates the transverse second harmonic pulse beam that is the autocorrelation signal to be recorded, which is imaged with an optical microscope onto a charge coupled device camera mounted perpendicular to the beams.

IPC Classes  ?

• G02F 1/37 - Non-linear optics for second-harmonic generation
• G01J 1/42 - Photometry, e.g. photographic exposure meter using electric radiation detectors
• G02B 21/36 - Microscopes arranged for photographic purposes or projection purposes
• G02F 1/355 - Non-linear optics characterised by the materials used
• G01J 1/04 - Optical or mechanical part
• G01J 1/16 - Photometry, e.g. photographic exposure meter by comparison with reference light or electric value using electric radiation detectors
• G01J 1/44 - Electric circuits

Abstract

The present application relates to the technical field of transportation, and discloses a novel system for detecting a multiple-vehicle collision and a related method. The system comprises: an optical fiber disposed at a roadside; a light source providing an optical signal to the optical fiber; a sensing device for detecting a phase change and/or a frequency shift of the optical signal in the optical fiber; and a collision detection device for identifying, according to the detected phase change and/or frequency shift of the optical signal in the optical fiber, whether a vehicle collision event has occurred. Implementation modes of the present application have the advantages of low costs, passive distribution, magnetic-interference prevention, and precise positioning, while also overcoming various shortcomings in conventional vehicle collision sensors such as complex installation, susceptibility to electromagnetic interference, and poor positioning accuracy.

IPC Classes  ?

• G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
• G08C 17/02 - Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Abstract

A multi-dimensional spatial positioning system and method for a disturbance source. The system includes a distributed optical fiber sensor (1), a sensing optical fiber (2), a coordinate system (3), a disturbance source to be monitored (4), a first signal group (5-1), and a second signal group (5-2). The disturbance source (4) is positioned by combining an array signal processing method with the distributed optical fiber sensor (1), using different laying manners for the sensing optical fiber (2) and a certain number of flexibly selected sensing units distributed a certain distance from each other along a line, and combining with a special signal processing method, thereby realizing a function of being capable of monitoring multi-dimensional spatial position information of the disturbance source (4) in real time in both short and long distances.

IPC Classes  ?

• G01S 5/22 - Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements

Abstract

An integrated super-resolution laser direct writing device and a direct writing method, the device comprises a continuous laser (1), a first optical fiber coupler (2), single-mode optical fibers (3), a second continuous laser (4), a second optical fiber coupler (5), first annular photonic crystal fibers (6), split fibers (7), a lens group (8), a first dichroic mirror (9), an LED light source (10), a lens (11), a second dichroic mirror (12), an automatic focusing module (13), a third dichroic mirror (14), a third optical fiber coupler (15), square-rate gradient fibers (16), a nano displacement table (17), a second lens (18), a CMOS camera (19) and a control system (20). The device implements the optical fiberization and system integration of key components, and can be better applied to the laser direct writing field.

IPC Classes  ?

• G03F 7/20 - ExposureApparatus therefor

Abstract

A non-Rayleigh speckle field-based correlated imaging spectral camera and an imaging method therefor. A device comprises a front imaging camera (1), a beam splitter (2), a bandpass filter (3), a monitoring detector (4), a polarizer (5), a beam splitter (6), a spatial light modulator (7), a surface array detector (8), and a computer (9). By utilizing the reversible feature of a light path, a non-Rayleigh speckle field can be generated in a lens-less condition and be applied in a compression sensing-based correlated imaging spectral camera, where the utilization of a super-Rayleigh speckle field for imaging increases the quality and resolution of a reconstructed image in a low signal-to-noise condition.

IPC Classes  ?

• G01J 3/28 - Investigating the spectrum

Abstract

A laser radar system apparatus for the multi-wavelength measurement of the atmospheric carbon dioxide concentration and a vertical aerosol profile, comprising: a laser transmitting unit; a dual-pulse laser (4) capable of simultaneously transmitting laser having three wavelengths, i.e., 1572 nm, 1064 nm, and 532 nm; a transmitting beam expander (5); a receiving telescope system (6); a visual axis monitoring module (7); a photoelectric detection unit (9); and a data acquisition and processing unit (15). The laser (4) that simultaneously outputs laser having three wavelengths is used in a laser radar system, and an optical differential absorption method and a high spectral resolution detection method are used, such that the atmospheric carbon dioxide concentration and the vertical aerosol profile can be measured simultaneously and high-precision aerosol monitoring is implemented during the high-precision obtaining of the concentration of the greenhouse gas carbon dioxide.

IPC Classes  ?

• G01S 17/95 - Lidar systems, specially adapted for specific applications for meteorological use
• G01S 17/00 - Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems

Abstract

An apparatus and method for efficiently coupling the spatial light to the optical fiber light for achieving the stability of an optical axis without a position sensor. The basic concept of the method is: first, obtaining, according to a theoretical coupling efficiency model, a model parameter by means of fitting calculation; second, using a four-point tracking algorithm to calculate an optical fiber nutation trajectory according to the optical fiber nutation principle; finally, using the nutation trajectory to calculate the position deviation of a central point. The optical axis is ensured to be stable by correcting the position deviation, and the high coupling efficiency is always remained. The method is used for the stability of the optical axis without the position sensor in a space coherent laser communication DPSK link, and the high efficiency coupling, is a key technology of long-distance, high bit rate transmission in the space laser communication, and is significant in the development of inter-satellite optical communications.

IPC Classes  ?

• H04B 10/61 - Coherent receivers

Abstract

A microwave resonant cavity for laser cooling, microwave interrogation, and atomic state detection, comprising a microwave resonant cavity body, two cutoff waveguide end covers, and four waveguides for laser beams and microwave coupling. The cavity feeds not only microwave but also laser beams into the center of the cavity. In a vacuum chamber with target atoms, the target atoms may be trapped and cooled in the center of the cavity. By sequential operation of the resonant microwave and lasers, the microwave resonant cavity of the present invention may manipulate and detect the atomic state population and interrogate the energy level of the cold atoms in situ. The invention may be applied to the fields of atomic frequency standard, interferometer and atomic gyro for developing the miniaturized cold atoms related precision measurement equipment.

IPC Classes  ?

• H03L 7/26 - Automatic control of frequency or phaseSynchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
• G04F 5/14 - Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
• H03B 17/00 - Generation of oscillations using a radiation source and a detector

Abstract

A three-dimensional imaging method based on K space transformation, the method using sheet-shaped light to illuminate a sample along the direction of an optical axis, and using an identical sheet-shaped light source to interfere with the illuminating light; recording an interferogram and acquiring therefrom complex amplitude information (comprising the amplitude and phase) of the illuminated sample in the focal plane; spatial frequency spectrum information of the sample can be acquired by means of discrete Fourier transformation; using a projection method to calculate spatial frequency spectrum information perpendicular to the plane of the sample; by means of discrete Fourier inverse transformation, acquiring strength information perpendicular to the plane of the sample; and, by means of scanning, acquiring final three-dimensional structure information of the sample. The method has a high acquisition rate and high resolution, particularly for the acquisition of axial information, and only needs to perform acquisition once to implement imaging.

IPC Classes  ?

• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
• G01N 21/47 - Scattering, i.e. diffuse reflection

Abstract

A single-shot Fresnel non-coherent correlation digital holographic device based on a polarization-oriented planar lens, comprising: A polarization-oriented planar lens (1) for wavefront modulation and beam splitting, a focusing element (2), a half-wave plate (3) with a small hole and a polarization imaging camera (4). Incident light passes through the polarization-oriented planar lens (1) and the focusing element (2) and is divided into two beams with different polarizations, that is, focused and parallel or focused and divergent beams, wherein the focused beam passes through the small hole of the half-wave plate (3), the parallel or divergent beam passes through the half-wave plate (3), so as to make the polarization of the two beams consistent behind pass through the half-wave plate (3). The holographic device performs wavefront modulation and beam splitting by using the characteristics of the polarization-oriented planar lens (1) sensitive to circularly polarized light, implements single-shot measurement of an imaging object by using a micro-polarization array in the polarization imaging camera (4), and has the advantages of being compact in structure, economical and practical, convenient to construct and easy to modulate.

IPC Classes  ?

• G03H 1/06 - Processes or apparatus for producing holograms using incoherent light

Abstract

Device and method for measuring in-situ time-resolved X-ray absorption spectrum. The device comprises an X-ray source, a first slit, an acousto-optic tunable X-ray filter, a radio frequency transmitter, a second slit, a front ionization chamber, a front ionization chamber signal amplifier, a sample to be tested, a rear ionization chamber, a rear ionization chamber signal amplifier, a data collector, and a computer. The X-ray source, the acousto-optic tunable X-ray filter, and the radio frequency transmitter are used to generate a monochromatic X-ray beam; the front ionization chamber is used to measure the intensity of the X-ray beam before passing through the sample; the rear ionization chamber is used to measure the intensity of the X-ray beam after passing through the sample; the front ionization chamber signal amplifier, the rear ionization chamber signal amplifier, the data collector, and the computer are used for data acquisition and data processing.

IPC Classes  ?

• G01N 23/083 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material and measuring the absorption the radiation being X-rays

Abstract

23232522323252323255: 1-5 mol%, respectively. A preparation method for the photodarkening-resistant ytterbium-doped quartz optical fiber. A sol-gel method and an improved chemical vapor deposition method are combined, and by using the molecular-level doping uniformity and the low preparation loss thereof respectively, ytterbium ions, aluminum ions and phosphorus ions are effectively doped in a quartz matrix, thereby effectively solving the problems in the optical fiber of high loss, photodarkening caused by cluster or the like, and a central refractive index dip.

IPC Classes  ?

• C03B 37/018 - Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means by glass deposition on a glass substrate, e.g. by chemical vapour deposition
• C03B 37/025 - Manufacture of glass fibres or filaments by drawing or extruding from reheated softened tubes, rods, fibres or filaments
• C03C 13/04 - Fibre optics, e.g. core and clad fibre compositions

Abstract

3 crystalline material with n-type conductivity characteristics by conventional processes, providing a basis for applications thereof to electrically powered electronic devices, optoelectronic devices, photocatalysts or conductive substrates.

IPC Classes  ?

• C30B 29/16 - Oxides
• C01G 15/00 - Compounds of gallium, indium, or thallium
• C30B 13/00 - Single-crystal growth by zone-meltingRefining by zone-melting
• C30B 33/02 - Heat treatment
• H01L 31/032 - Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups
• H01L 33/26 - Materials of the light emitting region
• H01B 1/08 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of other non-metallic substances oxides

Abstract

Method for preparing micro-optical structure on a film based on chemical mechanical polishing etching, combining photolithography technology with chemical mechanical polishing technology to make preparation and large-scale integration of large-size high-quality micro optical devices on-chip possible. The method comprises coating metal on film surface, selectively removing the metal film by photolithography (such as femtosecond laser selective ablation, ultraviolet photolithography, electron beam etching, ion beam etching, and reactive ion etching), chemical mechanical polishing, chemical corrosion or over polishing and other steps. Micro-optical devices on-chip prepared by the method have extremely high surface finish and extremely low optical loss. The method is applicable to preparing high-quality micro-optical structures (including but not limited to microdisc cavities, microring cavities, optical waveguides and coupled devices thereof) on various films on-chip (including but not limited to lithium niobate single crystal films, quartz films, silicon films, silicon dioxide films, diamond thin films, etc.).

IPC Classes  ?

• G02B 6/136 - Integrated optical circuits characterised by the manufacturing method by etching
• G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfacesMaterials therefor, e.g. comprising photoresistsApparatus specially adapted therefor
• C23F 1/26 - Acidic compositions for etching refractory metals
• G02B 6/12 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind

Abstract

Disclosed by the present invention are a radial servo device for a super-resolution optical disc and a servo control method therefor, wherein a radial servo control device thereof comprises an excitation light source, a servo light source, an integrated optical path, focusing units, a servo light detecting unit and a drive control unit; the drive control unit presets N detection error reference values with respect to each guide layer trench irradiated by servo light, and controls corresponding positions of the focusing units in N data tracks below each guide layer trench according to a comparison result between a detection result of servo reflected light and the detection error reference values. The present invention is applicable to a variety of super-resolution optical discs on the basis of stimulated radiation loss microscopy technology, a two-photon absorption technology, and the like, and achieves accurate radial servo control of super-resolution data tracks (<100 nm) without reducing the wavelength of servo light and the width of guide layer trenches.

IPC Classes  ?

• G11B 7/00 - Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower powerRecord carriers therefor

Abstract

Provided is a resistance spot welding electrode cap; a recess (33) is provided at the center of the welding contact interface (3) of the electrode cap; during welding, due to the presence of the recess (33), the area of contact between the electrode cap and a metal workpiece to be soldered is reduced; in the initial stage, the overall heat generation is concentrated on the outer ring of the weld point and heat dissipation becomes slower, helping a weld nugget to form from the outside to the inside; furthermore, due to the presence of the groove (33), the metal workpiece expands toward the groove (33) at the center of the electrode, thereby increasing the size of the weld nugget and reducing splash and deformation; in comparison with conventional electrode caps, the welding current required to form weld points of the same size is lower, saving on electricity costs; furthermore, weld points obtained using the same current have higher strength and stability with fewer welding defects.

IPC Classes  ?

• B23K 11/30 - Features relating to electrodes

Abstract

Method for limiting growth of KDP-type crystals with a long seed where an upper and a lower ends of the long seed crystal are respectively limited by an upper baffle plate and a lower tray to restrain growth of a pyramidal surface and allow only four prismatic surfaces in [100] and [010] directions to grow. Finally grown crystal contains no pyramid-prism interface that severely restricts quality of optical element, and all cut optical elements have high optical quality. As four prismatic surfaces are subjected to highly similar growing environment and grow simultaneously, all optical elements cut therefrom have high optical uniformity. Due to uniqueness of a cutting angle of a KDP crystal frequency-tripled element, high cutting efficiency is achieved in the element, and an area of a maximum frequency-tripled element that may be cut is known in advance according to a horizontal size of the grown crystal.

IPC Classes  ?

• C30B 7/08 - Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by cooling of the solution
• C30B 29/60 - Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
• C30B 29/14 - Phosphates
• C30B 29/64 - Flat crystals, e.g. plates, strips or discs

Abstract

A grating wavefront inclined dispersion compensation device, comprising a first blazed grating, an Offner optical system and a second blazed grating or a right-angle reflector. The grating wavefront inclined dispersion compensation device compensates for temporal stretching and spatial stretching caused by a grating angular dispersion effect, and ensures that the time-space dispersion of a light beam is zero when the light beam reaches a working surface. Compared to conventional grating-based wavefront inclination acquisition technology, the present invention fundamentally eliminates the influence of the grating angular dispersion effect on the applied effect of wavefront inclination technology.

IPC Classes  ?

• G01J 11/00 - Measuring the characteristics of individual optical pulses or of optical pulse trains
• G02B 27/42 - Diffraction optics
• G02B 27/44 - Grating systemsZone plate systems

Abstract

A measurement device and method for an in-situ time-resolved X-ray absorption spectrum. The measurement device mainly comprises an X-ray source (1), a first slit (2), an acousto-optic X-ray filter (9), a radio frequency transmitter (10), a second slit (4), a front ionization chamber (5), a front ionization chamber signal amplifier (11), a sample to be tested (6), a rear ionization chamber (7), a rear ionization chamber signal amplifier (13), a data collector (12), and a computer (14). The X-ray source (1), the acousto-optic X-ray filter (9), and the radio frequency transmitter (10) produce a monochromatic X-ray beam. The front ionization chamber (5) measures the intensity of the X-ray beam before the X-ray beam passes through the sample (6). The rear ionization chamber (7) measures the intensity of the X-ray beam after the X-ray beam passes through the sample (6). The front ionization chamber signal amplifier (11), the rear ionization chamber signal amplifier (13), the data collector (12), and the computer (14) acquire and process data. Mechanical components do not move during device measurement, the device can realize time-resolved measurement of an X-ray absorption spectrum and has high measurement accuracy.

IPC Classes  ?

• G01N 23/083 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material and measuring the absorption the radiation being X-rays

Abstract

The invention discloses a VB group element doped with a β-gallium oxide crystalline material, and a preparation method and application thereof. The series doped with the β-Ga2O3 crystalline material is monoclinic, the space group is C2/m, the resistivity is in the range of 2.0×10-4 to 1×104 Ω·cm, and/or the carrier concentration is in the range of 5×1012 to 7×1020 / cm3. The preparation method comprises steps of: mixing M2O5 and Ga2O3 with a purity of 4N or more at a molar ratio of (0.000000001-0.01):(0.999999999-0.99); and then performing crystal growth. The invention can prepare a high-conductivity β-Ga2O3 crystalline material with n-type conductivity characteristics by conventional processes, providing a basis for applications thereof to electrically powered electronic devices, optoelectronic devices, photocatalysts or conductive substrates.

IPC Classes  ?

• C30B 29/16 - Oxides
• C30B 13/00 - Single-crystal growth by zone-meltingRefining by zone-melting
• C30B 15/00 - Single-crystal growth by pulling from a melt, e.g. Czochralski method
• H01L 31/032 - Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups

Abstract

A micro-movement subassembly as a precise driving screw for angle adjustment, comprising a shank, a turnbuckle, and a central cylindrical shaft. The subassembly is precise for linear displacement, good orientation, stable and reliable adjustment, which can be used for a variety of precision-oriented precision micro-angle adjustment of the drive screw.

IPC Classes  ?

• F16H 3/06 - Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion with worm and worm-wheel or gears essentially having helical or herring-bone teeth
• F16H 27/02 - Step-by-step mechanisms without freewheel members, e.g. Geneva drives with at least one reciprocating or oscillating transmission member
• F16H 29/02 - Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action between one of the shafts and an oscillating or reciprocating intermediate member, not rotating with either of the shafts
• F16H 29/20 - Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action the intermittently-acting members being shaped as worms, screws, or racks
• G05G 23/00 - Means for ensuring the correct positioning of parts of control mechanisms, e.g. for taking-up play
• F16H 25/20 - Screw mechanisms
• G05G 1/08 - Controlling members for hand-actuation by rotary movement, e.g. hand wheels

Abstract

Apparatus and method for realizing tubular optical waveguides in glass by femtosecond laser direct writing. Irradiation in glass with focused femtosecond laser pulses leads to decrease of refractive index in the modified region. Tubular optical waveguides of variable mode areas are fabricated by forming the four sides of the modified regions with slit-shaped femtosecond laser pulses, ensuring single mode waveguide with a mode field dimension compatible with direct coupling to single-mode optical fibers.

IPC Classes  ?

• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• B23K 26/53 - Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
• G02B 6/13 - Integrated optical circuits characterised by the manufacturing method
• C03C 23/00 - Other surface treatment of glass not in the form of fibres or filaments
• G02B 6/00 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings
• B23K 103/00 - Materials to be soldered, welded or cut