Coherent light generators – Particular beam control device – Nonlinear device
Patent
1989-05-26
1990-09-11
Sikes, William L.
Coherent light generators
Particular beam control device
Nonlinear device
372 25, 372 26, 372 27, 372 33, 372 10, 372105, 372106, 372108, 307425, 307429, H01S 310
Patent
active
049557254
ABSTRACT:
A laser oscillator/amplifier system in which thermally induced birefringence in the gain media of the oscillator is compensated by thermally induced birefringence in the gain media of the amplifier. The system produces a quality output beam efficiently and with high power density in the preferred polarization. The oscillator cavity is characterized by a high reflector at one end and an output coupler at the second end with an oscillator gain medium exhibiting thermally induced birefringence in between. An amplifier exhibiting thermally induced birefringence which matches the thermally induced birefringence in the oscillator gain medium is mounted to receive the output of the oscillator cavity. A ninety degree rotator is mounted between the oscillator gain medium and the amplifier so that compensation for thermally induced birefringence in the oscillator gain medium is compensated by the matching thermally induced birefringence in the amplifier. The ninety degree rotator may be mounted inside the oscillator cavity, that is, between the oscillator gain medium and the output coupler; or it may be mounted outside of the oscillator cavity, that is, between the output coupler and the amplifier.
REFERENCES:
patent: 4360925 (1982-11-01), Brosnan et al.
patent: 4752931 (1988-06-01), Dutcher et al.
Robert Pixton, "Tripling yag frequency", Laser Focus, Jul. 1978, pp. 66-70.
Heritier et al., "Thermal Effects in High Power Q-Switched Lasers", SPIE OE-LASE Conference, Jan. 1988.
Scott et al., "Birefringence Compensation and TEM.sub.00 Mode Enhancement in a Nd:YAG Laser", Applied Physics Letters, vol. 18, No. 1, Jan. 1, 1971, pp. 3-4.
"DCR-3 and DCR-4 Pulsed Nd:YAG Lasers", Spectra-Physics Product Brochure, Nov. 1988.
Herbst Richard L.
Johnson Bertram C.
Epps Georgia Y.
Sikes William L.
Spectra Physics
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