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Found results for
 patents
1.
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Measuring the populations in each hyperfine ground state of alkali atoms in a vapor cell while limiting the contribution of the background vapor
| Application Number |
13759400 |
| Grant Number |
08907276 |
| Status |
In Force |
| Filing Date |
2013-02-05 |
| First Publication Date |
2013-10-17 |
| Grant Date |
2014-12-09 |
| Owner |
- VESCENT PHOTONICS, INC. (USA)
- HONEYWELL INTERNATIONAL INC. (USA)
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| Inventor |
- Nelson, Karl D.
- Salit, Kenneth
- Luey, Ben
- Anderson, Mike
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Abstract
A method for measuring the population of atoms in a vapor cell comprises collecting a sample of atoms, applying radio frequency (RF) spectroscopy to the sample such that a first portion of the atoms are in an upper ground state and a second portion of the atoms are in a lower ground state, and applying light to the sample to produce a first fluorescence such that all atoms are left in the lower ground state. The method further comprises measuring a population of the atoms in the upper ground state based on the first fluorescence, applying an RF pulse to the sample to transfer the atoms in the lower ground state to the upper ground state, and applying light to the sample after the RF pulse is applied to produce a second fluorescence. A population of all the atoms in the sample is then measured based on the second fluorescence.
IPC Classes ?
- 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
- H01J 49/46 - Static spectrometers
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2.
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Low power reduction of biases in a micro primary frequency standard
| Application Number |
13759444 |
| Grant Number |
09077354 |
| Status |
In Force |
| Filing Date |
2013-02-05 |
| First Publication Date |
2013-10-10 |
| Grant Date |
2015-07-07 |
| Owner |
- VESCENT PHOTONICS, INC. (USA)
- HONEYWELL INTERNATIONAL INC. (USA)
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| Inventor |
- Strabley, Jennifer S.
- Salit, Kenneth
- Nelson, Karl D.
- Luey, Ben
- Anderson, Mike
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Abstract
A method for reducing or eliminating clock bias in an atomic clock is provided. The method comprises cooling a population of atoms collected in the atomic clock using a laser locked at a predetermined frequency, turning off the laser, performing atomic clock spectroscopy, turning on the laser after the atomic clock spectroscopy, and relocking the frequency of the laser to an external reference cell. The population of atoms that are in each of two ground hyperfine levels is then probed using laser light that is on or near-resonant with a selected atomic transition.
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
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