Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1997-05-16
1999-03-09
Davie, James W.
Optical: systems and elements
Optical modulator
Light wave directional modulation
372 99, G02B 2608, M01S 308
Patent
active
058808736
ABSTRACT:
A stimulated Brillouin scattering (SBS) phase conjugate laser mirror uses a solid-state nonlinear gain medium instead of the conventional liquid or high pressure gas medium. The concept has been effectively demonstrated using common optical-grade fused silica. An energy threshold of 2.5 mJ and a slope efficiency of over 90% were achieved, resulting in an overall energy reflectivity of >80% for 15 ns, 1 um laser pulses. The use of solid-state materials is enabled by a multi-pass resonant architecture which suppresses transient fluctuations that would otherwise result in damage to the SBS medium. This all solid state phase conjugator is safer, more reliable, and more easily manufactured than prior art designs. It allows nonlinear wavefront correction to be implemented in industrial and defense laser systems whose operating environments would preclude the introduction of potentially hazardous liquids or high pressure gases.
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B. N. Borisov et al., "Wavefront inversion in induced Mandel'shtam-Brillouin scattering in a glass without failure", Sov. Phys. Tech. Phys. 25, pp. 645-646, May 1980.
A. M. Scott et al. "Methods for SBS Treshold Reduction," Naval Research Laboratory, Washington, DC 20375, Report No. NRL/FR/5460--94-9704, Jan. 30, 1994.
Dane Clifford B.
Hackel Lloyd A.
Davie James W.
The Regents of the University of California
Wooldridge John P.
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