Reference light source device using laser

Details Reference light source device using laser Reference light source device using laser

1993-11-04

1995-08-08

Pascal, Robert J.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

315134, 315151, 315158, 315156, 359115, 372 22, H05B 3702

Patent

active

054402077

ABSTRACT:
A reference light source device includes a first laser diode emitting a reference light, a harmonic generating unit for generating an nth harmonic of the reference light, where n is an integer, a light generating unit for generating a light signal having a waveform equal to that of the nth harmonic of the reference light, and a photodetector for combining the nth harmonic and the light signal and for generating a first electric signal corresponding to a beat signal obtained by combining the nth harmonic and the light signal. Further, the source device includes a local signal generating unit for generating a local signal, a phase comparator for generating a control signal corresponding to a phase difference between the first electric signal and the local signal, and a driving unit for driving the first laser diode according to the control signal so that a frequency of the beat signal is equal to that of the local signal.

REFERENCES:
patent: 4856011 (1989-08-01), Shimada et al.
patent: 4998043 (1991-03-01), Unami et al.
patent: 5249193 (1993-09-01), Watanabe
patent: 5303250 (1994-04-01), Masuda et al.

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