Abstract
Recently, there has been great interest in the temporal properties of four-wave mixing (FWM) in photorefractive media. The need for such studies results mainly from the solution of the steady state theory of FWM, which sometimes yields multiple solutions for the phase conjugate intensity, suggesting the possibility of bistable or multistable behavior of the reflectivity. In fact, several recent reports showed that the total internal reflection self-pumped phase conjugate mirror (cat mirror) in barium titanate exhibited unstable behavior (including optical chaos) In some experimental conditions.1 However, in this very special arrangement of FWM so many different mechanisms are involved (different gratings and internal feedback loops) that the real cause of the instabilities remains unknown.
© 1989 Optical Society of America
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