Coherent light generators – Particular component circuitry – Optical pumping
Patent
1992-12-03
1994-10-11
Epps, Georgia Y.
Coherent light generators
Particular component circuitry
Optical pumping
372 10, 372 12, H01S 300
Patent
active
053553837
ABSTRACT:
The present invention detects prelasing in a Q-switch laser and terminates laser operation upon such detection. A detector senses the presence of light beyond a Q-switch and generates an appropriate electrical signal. A comparison stage circuit compares this detector signal with an established threshold value indicative of prelasing and generates a trigger signal if this detector signal exceeds this threshold value. A control stage circuit receives both this trigger value and a sampled Q-switch signal indicative of an opening of the Q-switch. The control stage circuit terminates operation of the laser if the trigger signal from the comparison stage is received while the sampled Q-switch signal is being received to avoid the effects of prelasing. Appropriate delays and timing sequences are established.
REFERENCES:
patent: 4730113 (1988-03-01), Edwards et al.
patent: 4740986 (1988-04-01), Reeder
patent: 4880978 (1989-11-01), Cohn et al.
patent: 4884275 (1989-11-01), Simms
patent: 4947398 (1990-08-01), Yasuda et al.
patent: 4950268 (1990-08-01), Rink
patent: 5128949 (1992-07-01), Barnes
Chasteen Kimberly A.
Epps Georgia Y.
The United States of America as represented by the Administrator
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