Method and apparatus for generating two frequencies having a...

Oscillators – Automatic frequency stabilization using a phase or frequency... – Molecular resonance stabilization

Reexamination Certificate

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Reexamination Certificate

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07098744

ABSTRACT:
A method and apparatus that can generate two frequencies separated by the atomic hyperfine frequency separation needed to excite resonance in a Cs atom. In the present invention a coherent light source is frequency modulated with a modulation frequency having a sine wave to generate a lightwave. The lightwave comprises the two coherent optical fields having the frequency separation needed to excite resonance in the Cs atom. The modulation frequency can then be adjusted in order to fine-tune the frequency separation of the two coherent optical fields. The present invention also provides a method for localizing about 50% of the power in the lightwave at the two coherent optical fields by frequency modulating the light source with a square wave.

REFERENCES:
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patent: 6303928 (2001-10-01), Buell et al.
patent: 6320472 (2001-11-01), Vanier
patent: 6359916 (2002-03-01), Zhu
patent: 2002/0175767 (2002-11-01), Kitching et al.
Huang, X., Seeds, A.J., Roberts, J.S., and Knight, A.P., “Monolithically Integrated Quantum-Confined Stark Effect Tuned Laser with Uniform Frequency Modulation Response,” IEEE Photonics Technology Letters, vol. 10, pp. 1697-1699 (1998).
Kitching, J., Knappe, S., Vukicevic, N., Hopllberg, L., Wynands, R., Wiedmann, W., “A Microwave Frequency based on VCSEL-Driven Dark Line Resonances in Cs Vapor,” IEEE Trans. On Instruments and Measurements, vol. 49, pp. 1313-1317 (2000).
“Compact Atomic Clocks” INTERNET: <http://www.boulder.mist.gov/timefreq/ofm/smallclock/index/htm 28 pages.

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