Phase conjugate correction for high gain amplifier systems

Amplifiers – Parametric amplifiers – Semiconductor type

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307425, 372 9, H01S 323, H01S 330

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043215505

ABSTRACT:
A laser provides light of a first frequency .omega.+.DELTA. along a first optical path, the light being focused by optics onto a target disposed at the primary focal plane of the optics. A laser amplifier is disposed along a second optical path which receives light reflected from the target and processed through a portion of the optics. This amplifier transmits, substantially unamplified, light at the first frequency .omega.+.DELTA. and amplifies light substantially at a second frequency .cndot.. Phase conjugation apparatus is disposed along the second optical path and provides light which is the phase conjugate of light incident thereupon. The phase conjugated light is provided at the second frequency .omega. and directed back through the laser amplifier for amplification thereof and through the optics to the target. The phase conjugated light self-corrects for optical distortions introduced into the light caused by the optics and laser amplifier, resulting in a nearly diffraction-limited high-power light beam impinging upon the target. Four specific embodiments are provided which employ stimulated Brillouin scattering, three-wave mixing, four-wave mixing and photon echo processes, respectively, in the phase conjugation apparatus.

REFERENCES:
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Wang et al., "Correction of Phase . . . Brillouin Scattering", 1/78, Optics Letters, vol. 2, #1, pp. 4-6.
Bloom et al., "Observation of Amplified . . . Vapor", 3/78, pp. 58-60, Optics Letters, vol. 2, #3.
Stark, "Lasers and Power Systems . . . Reactors", 5/11/78, Americ. Nucl. Soci., 3rd Top. Meeting, NTIS OR78-1350, p. 10.
Heer et al, "Wave Front with Photon Echos", 10/77, pp. 49-50, Optics Communicators", vol. 23, #1.

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