Active hydrogen maser atomic frequency standard

Details Active hydrogen maser atomic frequency standard Active hydrogen maser atomic frequency standard

1996-09-19

1998-11-17

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 941, H03L 726

Patent

active

058382062

ABSTRACT:
An atomic maser includes a circuit (25) for effecting a shift in the frequency of a signal injected into a resonant cavity (4) so as to generate alternately a first and a second signal portion having respectively a frequency greater than and less than the natural frequency of stimulated emission, the first and second signal portions having a periodicity corresponding to a predetermined interrogation period. Circuitry (31,32,33,51,52) is responsive to a signal detected in the cavity (4) to produce an error signal representing the difference between the amplitude of the detected signal in response to the injection of the first and second signal portions. Further circuitry (53,54) adjusts the resonant frequency of the cavity in response to the error signal. A pulse generator 26 and a mixer 28 periodically apply both the first and second signal portions for a limited duration only during the interrogation period.

REFERENCES:
patent: 4449105 (1984-05-01), Frank et al.
patent: 4706042 (1987-11-01), Stein
patent: 5146184 (1992-09-01), Cutler
IEEE Transactions on Instrumentation and Measurement, vol. IM-36, No. 2, Jun. 1987, New York US, pp. 588-593, XP002005029 R.F.C. Vessot et al.:"A Hydrogen Maser at Temperatures Below 1 K".

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