Temperature and Spectral Dependences of Light-Induced Absorption in Photorefractive Sillenite Crystals

the beam propagation with regard to optical activity as well as without considering one is presented. We investigate numerically the influence of the magnitudes of external applied voltage and background illumination and of the size and polarization of input beam on the selffocusing. The conditions required for soliton-like propagation are obtained. We discuss also an evolution of the beam polarization state during propagation distance, which is connected with the optical activity.