Optical: systems and elements – Diffraction – From grating
Patent
1989-10-13
1992-07-14
James, Andrew J.
Optical: systems and elements
Diffraction
From grating
359241, 359300, 359315, G02B 523, G02F 101
Patent
active
051308495
ABSTRACT:
Enhanced energy transfers are achieved between optical beams by operating at wavelengths in the near-bandgap region of a photorefractive material, and employing an electrorefractive effect previously proposed only for single beams. An electric field is applied across a photorefractive medium of sufficient intensity to induce an electrorefractive coupling and consequent energy transfer between the beams. Gain enhancements are possible by orienting the photorefractive medium to obtain an electro-optic as well as an electrorefractive effect, and by a moving grating technique. The direction of energy transfer between the beams is controlled by the electric field direction, and can be reversed by reversing the field. Operation in the infrared region is made possible with semi-insulating materials. Applications include optical switches, amplifiers and phase conjugators.
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Garmire Elsa M.
Klein Marvin B.
Kost Alan
Partovi Afshin
Valley George C.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
James Andrew J.
Saadat Mahshid
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