Patent
1989-03-15
1990-09-25
Arnold, Bruce Y.
G02B 2710
Patent
active
049589083
ABSTRACT:
A coherent input beam from a laser is fed into a Brillouin-enhanced four wave mixer which generates a phase conjugated seed beam in counterpropagation with the input beam. A brillouin amplifier is provided between the laser and four wave mixer to transfer energy from the input beam to the seed beam and thereby amplify the seed beam to produce a phase conjugated output beam with approximately 50% of the energy of the input beam and narrow bandwidth which is free from random phase jumps associated with the acoustic noise generally required to initiate and sustain stimulated Brillouin scattering. The phase conjugated output beam can be modulated or steered in direction, as desired. Reference beams for the four wave mixer may be derived from the same laser source as the input beam and have energies one or more orders of magnitude smaller than the energy of the input beam.
REFERENCES:
B. Ya et al., "Connection Between the Wave Fronts of the Reflected and Exciting Light in Stimulated Mandel'Shtam-Brillouin Scattering" JETP Lett. 15, (1972), pp. 109-115.
V. V. Shkunov et al., "Optical Phase Conjugation", Scientific American, Dec. 1985, pp. 54-59.
D. M. Pepper, "Applications of Optical Phase Conjugation", Scientific American, Jan. 1986, pp. 74-83.
D. M. Pepper, "Nonlinear Optical Phase Conjugation", Laser Handbook vol. 4, Elsevier Science Publishers VG. 1985, pp. 333-334; 409, 454, 455-462.
N. F. Andreev et al., "Wave-front Inversion of Weak Optical Signals with a Large Reflection Coefficient", JETP Lett. vol. 32, No. 11, 12/5/80, pp. 625-629.
N. G. Basov, et al., "Phase Fluctuations of the Stokes Wave Produced as a Result of Stimulated Scattering of light", JETP Lett. 31, 1980, pp. 645-649.
N. G. Basov et al., "Investigation of a Hypersonic Wavefront-Reversing Mirror Operating in a Maser-Oscillator-Amplifier Configuration", Sov. J. Quantum Electron, 16 (6), Jun. 1986, pp. 788-791.
V. F. Efimkov et al., "Polarization Methods for Improvement of the Energy Characteristics of Wavefront-Reversing Mirros", Sov. J. Quantum Electron. 14 (2), Feb. 84, pp. 209-213.
Lind Richard C.
Pepper David M.
Rockwell Davis A.
Arnold Bruce Y.
Denson-Low W. K.
Duraiswamy V. D.
Gass Rebecca D.
Hughes Aircraft Company
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