Adaptive holographic interferometry applied to determine the material parameters of photosensitive crystals

The application of holographic interferometry methods based on interaction of a stationary reference light beam with a phase-modulated signal beam on the perturbation of dielectric tensor, which induced by them in the photosensitive crystals, is considered. These methods can be used for the measurement of material parameters that determine a magnitude of such perturbation. We have established the experimental conditions whereby a revealing of the contributions to the interaction for flexoelectric effect and electrogyration in the cubic photorefractive crystals of sillenite family is possible. In addition, the necessity of taking into account the contribution of a flexogyration effect to the interaction has been shown.