INFLUENCE OF PIEZOELECTRIC AND PHOTOELASTIC EFFECTS ON PULSE HOLOGRAMRECORDING IN PHOTOREFRACTIVE CRYSTALS

We consider photorefractive grating formation by short light pulses in transparent piezoelectric crystals. Solutions are obtained for the ti me behavior of the space-charge field and elastic displacements at a t ime interval that is much shorter than the time of the Maxwell relaxat ion. The contribution of the piezoelectric and the elasto-optic effect s to the dielectric impermeability tensor changes of the crystal at th e light frequency arising from the grating fields is taken into accoun t. Our numerical results show that the magnitude of the acoustic waves generated during photorefractive grating formation is substantial for GaAs and negligible for Bi12SiO20. We also consider the orientation d ependence of the coupling factor of the two optical waves at the grati ng vector lying in the (110) plane of GaAs.