A laser stabilization system for stabilizing a laser beam emitted by a laser includes a phase modulator configured to apply a phase modulation to received laser radiation, an optical cavity configured to receive the phase modulated laser radiation and provide amplitude modulated measurement radiation, and an optical detector configured to generate, based on the amplitude modulated measurement radiation, a radiofrequency electrical signal. A signal distribution network provides a digital branch electrical input signal and an analog branch electrical input signal to a digital control circuit and an analog control circuit, respectively. The digital control circuit generates, based on the digital branch electrical input signal, a first control signal, and the analog control circuit generates, based on the analog branch electrical input signal, a second control signal. An output interface supplies laser control output to the laser based on the first control signal and the second control signal.
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/137 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
H01S 5/0687 - Stabilising the frequency of the laser
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/136 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
H01S 5/068 - Stabilisation of laser output parameters
H01S 5/0683 - Stabilisation of laser output parameters by monitoring the optical output parameters
2.
HYBRID LOCKING ELECTRONICS FOR HIGH-SPEED, HIGH-PRECISION LOCKS TO ULTRA-STABLE HIGH FINESSE CAVITIES
A laser stabilization system for stabilizing a laser beam emitted by a laser includes a phase modulator configured to apply a phase modulation to received laser radiation, an optical cavity configured to receive the phase modulated laser radiation and provide amplitude modulated measurement radiation, and an optical detector configured to generate, based on the amplitude modulated measurement radiation, a radiofrequency electrical signal. A signal distribution network provides a digital branch electrical input signal and an analog branch electrical input signal to a digital control circuit and an analog control circuit, respectively. The digital control circuit generates, based on the digital branch electrical input signal, a first control signal, and the analog control circuit generates, based on the analog branch electrical input signal, a second control signal. An output interface supplies laser control output to the laser based on the first control signal and the second control signal.
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
3.
GETTER VACUUM PUMP TO MAINTAIN VACUUM PRESSURE WITHIN A HOUSING OF A FABRY-PEROT CAVITY
Methods and systems for controlling and maintaining the pressure in an ultra-stable optical resonance cavity are disclosed herein. A method for controlling and maintaining the pressure in an ultra-stable optical resonance cavity, for example, comprises providing an ultra-stable optical system housed in a vacuum housing enclosure and a pumping system in communication with the vacuum housing for maintaining a pressure in the vacuum housing less than 1×10−6 Torr. The pumping system may comprise combination pumping achieved with the simultaneous use of a getter pump and an ion pump that provide passive and active pumping, respectively. The pumping system may also comprise passive pumping only with a getter vacuum pump only. The present invention, disclosed herein, achieves passive, power-free pumping in ultra-stable laser systems thereby enhancing the portability of such systems.
Methods and systems for controlling and maintaining the pressure in an ultra-stable optical resonance cavity are disclosed herein. A method for controlling and maintaining the pressure in an ultra-stable optical resonance cavity, for example, comprises providing an ultra-stable optical system housed in a vacuum housing enclosure and a pumping system in communication with the vacuum housing for maintaining a pressure in the vacuum housing less than 1 × 10-6 Torr. The pumping system may comprise combination pumping achieved with the simultaneous use of a getter pump and an ion pump that provide passive and active pumping, respectively. The pumping system may also comprise passive pumping only with a getter vacuum pump only. The present invention, disclosed herein, achieves passive, power-free pumping in ultra-stable laser systems thereby enhancing the portability of such systems.
H01S 3/05 - Construction or shape of optical resonatorsAccommodation of active medium thereinShape of active medium
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/139 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity
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
5.
Implementation of a dual Fabry-Perot photonic pressure sensor
In an aspect, a pressure sensor for determining pressure in an environment comprises: a source for emitting a coherent reference light characterized by a reference light frequency; a first lock-in mechanism configured to send an electrical signal to the source based on a reference resonance frequency; a reference cavity; wherein the reference cavity is characterized by the reference resonance frequency; a modulator configured a reference light to generate at least a first sideband frequency such that an output of said modulator is a measurement light characterized by at least the first sideband frequency; a frequency synthesizer configured to drive the modulator; a second lock-in mechanism configured to send an electrical signal to the frequency synthesizer based on a measurement resonance frequency; and a measurement cavity configured to receive at least a portion of the measurement light; wherein the measurement cavity is characterized by the measurement resonance frequency; and wherein the pressure of the environment is determined based on the reference resonant frequency and the measurement resonance frequency.
G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means
G01C 19/72 - Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
G01N 21/45 - RefractivityPhase-affecting properties, e.g. optical path length using interferometric methodsRefractivityPhase-affecting properties, e.g. optical path length using Schlieren methods
In an aspect, a pressure sensor for determining pressure in an environment comprises: a source for emitting a coherent reference light characterized by a reference light frequency; a first lock-in mechanism configured to send an electrical signal to the source based on a reference resonance frequency; a reference cavity; wherein the reference cavity is characterized by the reference resonance frequency; a modulator configured a reference light to generate at least a first sideband frequency such that an output of said modulator is a measurement light characterized by at least the first sideband frequency; a frequency synthesizer configured to drive the modulator; a second lock-in mechanism configured to send an electrical signal to the frequency synthesizer based on a measurement resonance frequency; and a measurement cavity configured to receive at least a portion of the measurement light; wherein the measurement cavity is characterized by the measurement resonance frequency; and wherein the pressure of the environment is determined based on the reference resonant frequency and the measurement resonance frequency.
G01C 19/72 - Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
G01N 21/45 - RefractivityPhase-affecting properties, e.g. optical path length using interferometric methodsRefractivityPhase-affecting properties, e.g. optical path length using Schlieren methods
G01L 1/02 - Measuring force or stress, in general by hydraulic or pneumatic means
A system and method for delivering stable light to a remote location are provided. The method includes splitting a laser beam generated by a laser into a reference beam and a delivery beam. The delivery beam is coupled into an optical fiber for delivery to the remote location. A reflected portion of the delivery beam comes back as a reflected delivery beam from the remote location through the optical fiber. An interference beam is generated by combining the reference beam and the reflected delivery beam. A phase difference between the reference beam and the reflected delivery beam is detected in order to adjust a phase of the laser beam based on the phase difference to reverse a phase shift of the delivery beam induced by noise added to the delivery beam while the delivery beam is transmitted through the optical fiber.
A system and method for delivering stable light to a remote location are provided. The method includes splitting a laser beam generated by a laser into a reference beam and a delivery beam. The delivery beam is coupled into an optical fiber for delivery to the remote location. A reflected portion of the delivery beam comes back as a reflected delivery beam from the remote location through the optical fiber. An interference beam is generated by combining the reference beam and the reflected delivery beam. A phase difference between the reference beam and the reflected delivery beam is detected in order to adjust a phase of the laser beam based on the phase difference to reverse a phase shift of the delivery beam induced by noise added to the delivery beam while the delivery beam is transmitted through the optical fiber.
G01B 9/02001 - Interferometers characterised by controlling or generating intrinsic radiation properties
G01B 9/02004 - Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies using frequency scans
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
G02F 1/11 - 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 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
A laser stabilization system and method are provided. The laser stabilization system includes: a laser configured to produce a laser light signal at a target frequency; a phase modulator configured to apply a phase modulation to the laser light signal to produce a phase modulated laser light signal; a stable optical resonator configured to receive the phase modulated laser light signal and return a light signal; a light detection system configured to receive the light signal from the stable optical resonator and produce an amplitude modulated electrical signal based on the light signal; and a digital domain circuit configured to generate a control signal based on the amplitude modulated electrical signal.
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/137 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
A laser stabilization system and method are provided. The laser stabilization system includes: a laser configured to produce a laser light signal at a target frequency; a phase modulator configured to apply a phase modulation to the laser light signal to produce a phase modulated laser light signal; a stable optical resonator configured to receive the phase modulated laser light signal and return a light signal; a light detection system configured to receive the light signal from the stable optical resonator and produce an amplitude modulated electrical signal based on the light signal; and a digital domain circuit configured to generate a control signal based on the amplitude modulated electrical signal.
A method for adjusting an optical cavity's length includes: measuring a first absolute frequency corresponding to a cavity mode, the optical cavity having a first and second mirror having respective first and second mirror surfaces separated by a first cavity length, and a resonator body interposed therebetween; determining a length difference between the first cavity length and a target cavity length corresponding to a plurality of resonance frequencies that includes a target absolute optical frequency; removing the first mirror to expose a first end of the resonator body; depositing, on one of the first end and the first mirror, a spacer having a thickness within a length tolerance of the determined length difference; and reversibly securing the first mirror to the resonator body, the spacer being between the first mirror and the resonator body, the first and second mirrors being separated, within the length tolerance, by an adjusted cavity length.
H01S 3/139 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity
H01S 3/105 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity
G01B 11/02 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness
H01S 3/137 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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