Abstract
Taking the crystal surface to be traction free, we calculate the lattice distortions and associated elasto-optic refractive-index changes induced by a photorefractive grating. The surface effects are significant and result in refractive-index changes near the surface that differ considerably from bulk values. Such surface effects should be of importance in thin-film photorefractive devices, in thin samples, and in certain situations in bulk crystals.
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