Abstract
Photorefractive materials exhibit a large optical nonlinearity which can efficiently couple even weak optical beams. If the nonlinear coupling strength exceeds a certain threshold (whose value depends on geometry), stimulated beams appear. We will review recent experiments demonstrating the mischievous and often useful properties of these stimulated beams. For example, a single-beam incident on a crystal of photorefractive barium titanate can stimulate the generation of a phase-conjugate beam.
© 1986 Optical Society of America
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