Coherent light generators – Particular beam control device – Q-switch
Patent
1981-03-06
1987-05-26
Scott, Jr., L/e/ on
Coherent light generators
Particular beam control device
Q-switch
372 25, 372 38, H01S 3115
Patent
active
046690859
ABSTRACT:
The present invention provides a jitter stable electro-optical modulator for modulating a high power, repetitively pulsed laser having an optical risetime (10% to 90%) of the order of nanoseconds. The electro-optical modulator includes a birefringent electro-optical device; a hydrogen thyratron operated at a preselected high pressure and having an "ON" and an "OFF" state; first means responsive to the "ON" state of the thyratron for impressing a first preselected voltage across the birefringent electro-optical device; second means responsive to the "OFF" state of the hydrogen thyratron for impressing a second preselected voltage across the electro-optical modulator at a time coincident with the laser buildup interval; and means for repetitively driving the hydrogen thyratron into the "ON" and the "OFF" states repetitively at a preselected repetition rate. The selectively pressurized hydrogen thyratron is placed within a close-fitting vented copper housing and is electrically connected across the electrodes of the birefringent device by an impedance matching network and a coaxial cable.
REFERENCES:
patent: 3701956 (1972-10-01), Simmons
patent: 3757249 (1973-09-01), Carmine, Jr. et al.
patent: 3783403 (1974-01-01), Hook et al.
patent: 3783406 (1974-01-01), Hook et al.
patent: 3815046 (1974-05-01), Johnson et al.
patent: 3818373 (1974-06-01), Chun et al.
"Transient Elastooptic Effects and Q-Switching Performance in Lithium Nioe and KD*P Pockels Cells," Hilberg and Hook, Journal of Appl. Optics, vol. 9, No. 8, pp. 1939-1940 (Aug. 1970).
Mack Michael E.
Plourde Bertrand E.
Lall Prithvi C.
McGill Arthur A.
McGowan Michael J.
Scott, Jr. L /e/ on
The United States of America as represented by the Secretary of
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