Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1991-08-29
1992-09-15
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Optical output stabilization
372 38, 333 3, 333 941, H01S 313
Patent
active
051484374
ABSTRACT:
A laser emits a laser beam with a predetermined frequency, serving as pumping light, to a double resonance section. A VCO oscillates a predetermined frequency signal that is the origin of a microwave. An oscillator oscillates a modulation signal and a low frequency signal to be a reference signal for a sync detection. A synthesizer generates a microwave acquired by subjecting the predetermined frequency signal to multiplication and phase modulation in accordance with the predetermined frequency signal and the modulation signal, and applies the microwave to the double resonance section. A photosensor detects a component of the laser beam modulated by the double resonance section. A PSD detects the level and phase of an output signal of the photosensor with the reference signal. A sweep signal generator generates a sweep signal for the microwave. A switch has first and second nodes to be mutually switched from one to the other, and feeds a PSD output back to the VCO when switched to the first node, and supplies the sweep signal to the VCO to permit sweeping of the frequency of the microwave when switched to the second node. An integration processor detects the amount of shift of a microwave resonance frequency according to the PSD output and feeds a laser frequency compensation signal back to the laser, in a state where the switch is set to the second node.
REFERENCES:
patent: 4316153 (1982-02-01), Busca et al.
patent: 4740761 (1988-04-01), Barnes et al.
patent: 4918700 (1990-04-01), Gambini
Article entitled "Ultra-Sensitive Frequency Discrimination in a Diode Laser Pumped .sup.87 Rb Atomic Clock" by M. Hashimoto, et al. presented at the 41st Annual Frequency Control Symposium, Jun. 1987, Philadelphia, Pa., Session B3, Paper number 3 pp. 74-84.
Modulation Transfer and Optical Stark Effect in a Rubidium Atomic Clock Pumped by a Semiconductor Laser, J. Opt. Soc. Am. B/vol. 6, No. 10/Oct. 1989; pp. 1777-1789.
Experiments on a Semiconductor Laser Pumped Rubidium Atomic Clock, M. Hashimoto & M. Ohtsu; 1987 IEEE; vol. QE-23, No. 4, Apr. 1987; pp. 446-451.
IEEE Transactions on Instrumentation and Measurement, vol. 39, No. 3, Jun. 1990, pp. 458-462.
IEEE Journal of Quantum Electronics, vol. QE-21, No. 12, Dec. 1985, pp. 1905-1912.
Anritsu Corporation
Epps Georgia Y.
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