Multipass laser amplifier with at least one expanded pass

Details Multipass laser amplifier with at least one expanded pass Multipass laser amplifier with at least one expanded pass

1988-11-21

1990-04-17

Buczinski, Stephen C.

Amplifiers

Parametric amplifiers

Semiconductor type

372 92, H01S 308

Patent

active

049183958

ABSTRACT:
A laser amplifier with high gain and high power efficiency comprises a gain medium characterized by at least two optical paths through the gain medium. An optic supplies the input laser pulse along a first optical path, so that the laser pulse has a transverse dimension D.sub.i as it propagates along the first optical path and exits the gain medium as a first pass amplified pulse. A second optic expands the first pass amplified pulse in the transverse dimension to an expanded pulse with transverse dimension D.sub.e, and guides the expanded pulse along a second optical path through the gain medium. The laser pulse exits the gain medium as a second pass amplified pulse. A third optic in a preferred system guides the second pass amplified pulse along a third optical path through the gain medium so that the laser pulse exits the gain medium as the output pulse.

REFERENCES:
patent: 3942127 (1976-03-01), Fluhr et al.
patent: 3968456 (1976-07-01), Welch
patent: 4019151 (1977-04-01), Brueckner et al.
patent: 4142191 (1979-02-01), Ward
patent: 4156852 (1979-05-01), Hagen
patent: 4656433 (1987-04-01), Franklin et al.
Thomas James Kane, "Coherent Laser Radar at l.06 Microns Using Solid State Lasers", Aug. 1986.
Heritier et al., "Thermal Effects in High Power Q-Switched Lasers".

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