Method for stabilizing the resonance frequency of a rubidium fre

Details Method for stabilizing the resonance frequency of a rubidium fre Method for stabilizing the resonance frequency of a rubidium fre

1981-07-20

1984-07-24

Miller, Stanley D.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 941, 350275, H03L 726

Patent

active

044620063

ABSTRACT:
A method and apparatus for stabilizing the resonance frequency of a rubidium frequency standard utilizes control of the intensity of the rubidium-87 lightbeam between the rubidium lamp and rubidium vapor cell. Resonance frequency stabilization is achieved by the present invention by providing adjustment of pumping light intensity until the sensitivity of resonance frequency to changes in cell temperature is minimized and the cell operating temperature is at its turning point, that is, where resonance frequency shift versus temperature goes through a zero slope. By utilizing the invention, the light crossover point, that is, a point of convergence of the family of curves of frequency deviation versus temperature for different levels of rubidium lamp excitation discharge current, can be set equal to the cell turning point. A preferred embodiment of an apparatus for carrying out the method comprises a planar plate positioned between the lamp and the cell and having an aperture aligned with the lightbeam and including adjustable means, such as a threaded opaque object, for partially blocking the lightbeam to selected degrees by decreasing the area of the aperture.

REFERENCES:
patent: 3517201 (1970-06-01), Gilford et al.
patent: 3709600 (1973-01-01), Ganshorn

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