Critical angle rotating prism Q-switch

Details Critical angle rotating prism Q-switch Critical angle rotating prism Q-switch

1987-11-02

1989-02-28

Sikes, William L.

Coherent light generators

Particular beam control device

Q-switch

H01S 311

Patent

active

048092827

ABSTRACT:
A CO.sub.2 TEA laser Q-switch uses an intra cavity rotating prism (70) with internally reflecting surfaces (76, 78) at near the critical angle to produce a variable optical loss such that the gain of the laser is switched as the prism rotates through the critical angle. The nitrogen tail portion of the laser output pulse can be eliminated by switching the gain just after the main pulse at the beginning at the tail. An opto-electronic timing device (100), which includes a graded index glass rod (101) rotating with the Q-switch prism, generates a pulse (88) to initiate the laser discharge at the proper lead time before the prism switches the resonator gain.

REFERENCES:
patent: 3398379 (1968-08-01), Sims
patent: 3434073 (1969-03-01), Forkner
patent: 3487331 (1969-12-01), Gates
patent: 3588249 (1971-06-01), Studebaker
patent: 3597702 (1971-08-01), Dumanchin
patent: 3711788 (1973-01-01), Forkner
patent: 3725817 (1973-04-01), Nolan
patent: 3995230 (1976-11-01), See
patent: 4525034 (1985-06-01), Simmons
patent: 4564949 (1986-01-01), Trolinger
patent: 4660204 (1987-04-01), Dewhirst et al.
"New Laser Technique for Ranging Application"; Nerem Record; pp. 34, 35; 1962; by Benson et al.

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