Atomic time standard with piezoelectric stabilization of diode l

Details Atomic time standard with piezoelectric stabilization of diode l Atomic time standard with piezoelectric stabilization of diode l

1994-09-09

1995-08-15

Grimm, Siegfried H.

Oscillators

Molecular or particle resonant type

331 3, H03L 726

Patent

active

054423260

ABSTRACT:
The wavelength of light generated by a diode laser optically pumping vapor in the gas cell of an atomic time-standard is stabilized against variations in ambient temperature by application of pressure to the semiconductor laser by a piezoelectric transducer, preferably implemented as thin films on the diode structure. Closed loop control of the pressure is provided by feeding back a detector signal, which is a measure of light transmitted through the vapor, to a null seeking servo the output of which is converted to a control signal which is a function of temperature/pressure. The control signal, which is applied to the piezoelectric transducer, which in turn is preferably implemented as a thin film on the diode structure, can be dithered to sense and maintain the desired resonant atomic transition frequency. The vapor is additionally excited by a microwave signal locked to an atomic transition frequency through feedback of the detector signal.

REFERENCES:
patent: 4935935 (1990-06-01), Reed et al.
patent: 5148437 (1992-09-01), Ohtsu
patent: 5192921 (1993-03-01), Chantry et al.
patent: 5327105 (1994-07-01), Liberman et al.
Piezoelectrically Induced Stress Tuning of Electro-Optic Devices; C. Y. Hung, T. E. Schlesinger, and M. L. Reed; Appl. Phys. Lett. 59(27), 30 Dec. 1991; pp. 3598-3600.
Microelectromechanical Tuning of Electrooptic Devices; C. Y. Hung, R. Burton, T. E. Schlesinger, M. L. Reed; Micro Electro Mechanical Systems '92; Travemunde (Germany), Feb. 4-7, 1992; pp. 154-157.

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