Apparatus for and method of extracting an output beam from a las

Details Apparatus for and method of extracting an output beam from a las Apparatus for and method of extracting an output beam from a las

1986-04-14

1987-07-21

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Specified output coupling device

372105, 372 99, 372 93, H01S 308

Patent

active

046823409

ABSTRACT:
The output of a laser oscillator is doubly passed through a birefringement medium, a quarter-wave plate and a laser amplifier by reflection from a phase conjugate mirror, the birefringent medium being between the oscillator and the plate in the path of the initial and reflected oscillator output. The birefringent medium divides the oscillator output into a first set of orthogonal polarization components (rays) and refracts one of them at a first angle successively through the plate and amplifier for reflection from the mirror through the amplifier, plate and medium. The reflected ray is amplified and then divided by the medium into a second set of orthogonal ray components which exit the medium at different angles away from the oscillator. In another embodiment, a second quarter-wave plate is added between the amplifier and mirror, and in a third embodiment the amplifier is positioned between the oscillator and the birefringent medium. These designs represent a unique means of separating in angle the oscillator input beam and the phase-conjugated/amplified beam. This results in a physical positional separation of the two, which allows the latter beam to be readily extracted and utilized in a useful fashion, and prevents potentially damaging reflections from being fed back into the oscillator.

REFERENCES:
patent: 4441186 (1984-04-01), Erickson
Hon, "Pulse Compression by Stimulated Brillowin Scattering", Optics Lett., vol. 5, No. 12, Dec. 1980, p. 516.

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