Abstract
ABSTRACT We report the results of the analysis of the elastic field structure in the region near the Y-plane of the BaTiO3 crystal. Theassumption of given interference light pattern with a fringe spacing A and an independent on y modulation index m at steady-state is used. The photorefractive grating vector kg S assumed to be parallel to Z-axis of the crystal. Taking the crystalsurface to be traction free we consider two cases: (a) dielectric boundary and (b) short-circuited boundary.We have analyzed the changes in optical permittivity tensor, at optical frequencies. It is shown that near the crystalsurface, these changes are different from their volume values.Keywords: space-charge field, surface relief, elastic displacement, optical permittivity tensor 1. INTRODUCTION The photorefractive crystals are the very attractive materials for many applications in the field of optical information processing, optical memories, optical phase conjugation, spatial light modulators, holography and dynamic opticalinterconnections2 because of large optical nonlinearities. Most of these technical spheres and devices used bulkphotorefractive crystals. However, the great attractiveness of nonbulky materials caused several recent studies of
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