We propose a new control method of the bistable values of the phase conjugate reflectivity in photorefractive four-wave mixing with beam fanning. Analyzing steady state values and temporal responses of the phase conjugate reflectivity, we indicate that one of the bistable values can be selected arbitrarily by the well controlled erase beam which has an erasing effect on the photorefractive index grating. Besides, theoretical results are examined experimentally.

© 1999 Optical Society of America

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