Method and a device for the frequency control of an atomic or mo

Details Method and a device for the frequency control of an atomic or mo Method and a device for the frequency control of an atomic or mo

1986-05-21

1987-09-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 941, H03L 726

Patent

active

046927166

ABSTRACT:
The method realizes the frequency control of a frequency standard including an atomic or molecular beam resonance apparatus with two microwave cavities, to which an electromagnetic field is fed, whose frequency is modulated in time with a sinewave signal about an interrogation frequency near to the characteristic resonance frequency of a selected transition of the atoms or molecules of the beam. In the resonance device a current is generated, proportional to the number of atoms or molecules of the beam which have undergone said transition as an effect of their passing through the cavities. The method includes the step of extracting from said current the component whose frequency is an odd harmonic of the modulation frequency of an order higher than the first, in particular the third. Said component is coherently demodulated, in amplitude and sign, to generate a control signal which is used to steer the frequency of said electromagnetic field, in such a way as to minimize the difference between the interrogation frequency and the characteristic resonance frequency of the atomic or molecular transition.

REFERENCES:
patent: 2964715 (1960-12-01), Winkler
patent: 2972115 (1961-02-01), Zacharias et al.
patent: 3354307 (1967-11-01), Holloway et al.
patent: 3407295 (1968-10-01), Lacey

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