ANISOTROPIC GRATING RECORDING IN PHOTOREFRACTIVE KNBO3FE

Abstract

The first observation of an anisotropically recorded grating (with two orthogonally polarized beams) in photorefractive KNbO3:Fe is reported. We attribute the effect to influences of the nondiagonal elements beta113, and beta223 of the photovoltaic tensor. With the help of anisotropic diffraction from the grating we estimate the lower limit of these tensor elements. The diffraction efficiency strongly depends on the recording angle.