Coherent light generators – Particular component circuitry – Optical pumping
Patent
1986-03-05
1988-09-27
Laroche, Eugene R.
Coherent light generators
Particular component circuitry
Optical pumping
350355, 350393, 350 362, 350356, 372 99, G02B 523, G02F 101, G02F 103, G03H 102
Patent
active
047737395
ABSTRACT:
A self-pumped phase conjugate mirror and method is disclosed in which an optical beam is applied to a crystal formed from a photorefractive material, the beam is deflected back into the crystal as a return beam to cross-couple with the input probe beam, and an alternating electric field is applied across the crystal to establish a photorefractive index grating shift of about 90.degree. and bring the crystal gain up to a level at which phase conjugation takes place. By a suitable selection of field strength and frequency, and an angle between the probe and return beams within the crystal of less than about 5.degree. (3.degree. for GaAs), semiconductor materials with electro-optic coefficients of less than about 10 picometers/volt can be used as the conjugating medium. Such materials have previously not worked in a self-pumped conjugator, but are much more readily available, more responsive, and have improved bandwidths compared to substantially higher electro-optic coefficient refractive materials that have been used in prior inherently self-pumped conjugators.
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Klein Marvin B.
Valley George C.
Duraiswamy V. D.
Hughes Aircraft Company
Karambelas A. W.
LaRoche Eugene R.
Shingleton Michael B.
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