Miniature atomic frequency standard controlled by a digital proc

Details Miniature atomic frequency standard controlled by a digital proc Miniature atomic frequency standard controlled by a digital proc

1995-11-06

1997-02-25

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 941, H03L 726

Patent

active

056062915

ABSTRACT:
A digital controller time multiplexes dithering of the microwave frequency control signal and a laser wavelength control signal in a miniaturized cesium vapor atomic frequency standard. A unique common charge/sample and dump integrator amplifies the photodetector output for the + and - dither of both the laser current and microwave frequency. To suppress error in the integrated photodetector output attributable to noise generated by the digital processor, the processor is placed in a sleep mode during the integration intervals. To further suppress errors, the cesium vapor electric heaters are not energized during the intervals when the microwave signal is being dithered.

REFERENCES:
patent: 5148437 (1992-09-01), Ohtsu
patent: 5192921 (1993-03-01), Chantry et al.
patent: 5442326 (1995-08-01), Liberman

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