Two-mirror shaping of a non-circular optical pumping beam and la

Details Two-mirror shaping of a non-circular optical pumping beam and la Two-mirror shaping of a non-circular optical pumping beam and la

1988-04-25

1990-08-07

Sikes, William L.

Coherent light generators

Particular pumping means

Pumping with optical or radiant energy

372 69, 372 71, 372 75, 372101, 350619, H01S 3091

Patent

active

049474022

ABSTRACT:
In a laser, the laser gain member is optically pumped by a semiconductive source of pumping radiation having an elongated output beam aperture such as that provided by a single-wide stripe diode or diode array. The elongated beam of optical pumping radiation is twice reflected from a concave surface at non-normal angles of incidence and then focused onto the laser gain material for pumping same. The reflections serve to differentially focus rays diverging in the vertical plane from rays diverging in the horizontal plane to shape the pumping beam for improved pumping efficiency in the pumped mode volume of the laser gain material. In a preferred embodiment, a magnifying lens is disposed inbetween the source and the reflectors for decreasing the divergence of the pumping beam.

REFERENCES:
patent: 2869423 (1959-01-01), Hoge et al.
patent: 3732505 (1973-05-01), Freedman
patent: 3957339 (1976-05-01), Engel
patent: 4185891 (1980-01-01), Kaestner
patent: 4739507 (1988-04-01), Byer et al.

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