Atomic frequency clock systems and methods

Details Atomic frequency clock systems and methods Atomic frequency clock systems and methods

2011-06-21

2011-06-21

Chang, Joseph (Department: 2817)

Oscillators

Molecular or particle resonant type

C331S003000

Reexamination Certificate

active

07965148

ABSTRACT:
One embodiment of the invention includes an atomic clock system including an alkali beam cell and an interrogation system configured to generate an optical pump beam and at least one optical probe beam that illuminate a detection chamber of the beam cell to pump evaporated alkali metal atoms. An optical detection system can provide a microwave signal to the detection chamber and can measure an intensity of the optical pump beam to determine a transition frequency corresponding to optimum photon absorption of the evaporated alkali metal atoms. A photodetection system can measure an intensity of the at least one optical probe beam and to generate an intensity signal that is provided to the optical detection system to substantially cancel Doppler broadening of the transition frequency resulting from non-orthogonal planar movement of the evaporated alkali metal atoms relative to the optical pump beam and the at least one optical probe beam.

REFERENCES:
patent: 5148437 (1992-09-01), Ohtsu
patent: 5657340 (1997-08-01), Camparo et al.
patent: 6320472 (2001-11-01), Vanier
patent: 2009/0309668 (2009-12-01), Bulatowicz et al.

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