Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1978-05-23
1980-09-02
Moskowitz, Nelson
Amplifiers
Parametric amplifiers
Semiconductor type
332 751, 350 381, 331 945C, H01S 310, H01S 330
Patent
active
042209285
ABSTRACT:
Linear phase aberrations in laser amplifier systems are adaptively corrected by a device which propagates an object beam formed by reflection of a laser beam from a target backwards through a laser amplifier chain in order to sample the linear phase aberrations and produces a conjugate image beam by degenerate four-wave mixing in a medium having a third order nonlinearity in susceptibility. The conjugate image beam which is amplified as it propagates back through the laser amplifier chain has the linear phase aberrations removed. The device also corrects for birefringent aberrations contained in the laser amplifier chain when (1) the medium has an isotropic nonlinearity; (2) the polarization of the pump beams, required for four-wave mixing, lies in the plane formed by the object beam and the pump beams; and (3) the angle between the object beams and the pump beams is substantially 90 degrees. The degenerate four-wave mixing is accomplished in one embodiment by gain saturation in Nd:YAG.
REFERENCES:
patent: 4145671 (1979-03-01), Hellwarth
Jensen et al., "Observation of the Time-Reversed . . . Wave", 2/78, pp. 166-168, Appl. Phys. Lett., vol. 32, #3.
Hellwarth, "Generation of Time Reversed . . . Refraction", 1/77, pp. 1-3, J. Opt. Soc. Am., vol. 67, #1.
Yariv et al., "Amplified Reflection . . . Mixing", 7/77, pp. 16-18, OpticsLetters, vol. 1, #1, GZ54.
"Generation of Time Reversed . . . Waves", p. 26, Hellwarth et al., 5/78, Laser Focus.
Bloom et al., "Observation of Amplified . . . Vapor", 3/78, pp. 58-60, Optics Letters, vol. 2, #3.
Bloom et al., "Conjugate Wave Front . . . Mixing", 11/77, pp. 592-594, Appl. Phys. Lett., vol. 31, #9.
Hill, "Simple Transient Holograms in Ruby", 7/71, pp. 1695-1697, Applied Optics, vol. 10, #7, G-254.
Abrams et al., "Degenerate Four-Wave . . . Media", 4/78, pp. 94-96, Optics Letters, vol. 2, #4.
Bloom David M.
Liao Paul F.
Bell Telephone Laboratories Incorporated
Dubosky Daniel D.
Moskowitz Nelson
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