PHOTOREFRACTIVE SURFACE-WAVES IN A THIN BI12TIO20 CRYSTAL

A theoretical model considering total internal reflections of fanned b eams from the side crystal surfaces and their coupling with the pump b eam is proposed. The interaction of these beams results in the light i ntensity redistribution and in the generation of the photorefractive s urface wave. An experimental observation of the light intensity self-c oncentration near the surface of a thin photorefractive Bi12TiO20 crys tal is reported. It results in an acceleration of the photorefractive energy exchange process.