Miniature atomic frequency standard

Details Miniature atomic frequency standard Miniature atomic frequency standard

1995-09-25

1997-09-23

Pascal, Robert

Oscillators

Molecular or particle resonant type

331 3, 250251, H01S 100, H03L 726

Patent

active

056709145

ABSTRACT:
A miniature atomic frequency standard utilizes a tubular vapor cell extending transversely through a TE.sub.210 microwave cavity. In one embodiment of the invention, the vapor cell is heated directly by electric heaters secured to ends of the tubular vapor cell which extend outside the microwave cavity. The vapor cell is insulated by thermal insulation inside the microwave cavity and between the microwave cavity and a magnetic shield. In another embodiment of the invention, the entire microwave cavity is heated which eliminates the need for thermal insulation inside the cavity and thus it can be made smaller, but additional thermal insulation is provided between the microwave cavity and the magnetic shield. Preferably, the C-field coil is wound on the thermal insulation just inside the magnetic shield to reduce heat loss by conduction. A laser diode outside the magnetic shield transmits light to the vapor cell through optic fiber without need for a collimating lens and a photodiode with an integral lens is used as the detector.

REFERENCES:
patent: 5192921 (1993-03-01), Chantry et al.
patent: 5327105 (1994-07-01), Liberman et al.
patent: 5442326 (1995-08-01), Liberman
patent: 5517157 (1996-05-01), English
Patent Abstracts of Japan, vol. 006, No. 115 (E-115), 26 Jun. 1982 and JP A, 57 043484 (Fujitsu Ltd), 11 Mar., 1982.
Patent Abstracts of Japan, vol. 009, No. 189 (E-333), 6 Aug. 1985 and JP,A,60 058688 (Nippon Denki KK), 4 Apr. 1985.
Patent Abstracts of Japan, vol. 004, No. 117 (E-022), 20 Aug. 1980 and JP,A,55 072094 (Seiko Epson Corp), 30 May 1980.

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