Abstract
ABSTRACT We theoretically investigate the propagation of a one-dimensional (1D) polarized light beam in cubic photorefractive crystals of 23 symmetry group. Light beam propagation was considered under condition applied to the crystal external electric field for increasing the photorefractive response. Within paraxial approach we obtain the self-consistent system of equations for scalar amplitudes of two optical eigenmodes and the photoinduced space charge field. We have shown that the natural circular and induced by external and internal electric field linear birefringence determine the character of transformation of the spatial structure of the beam. For transverse optical configuration of the crystal sample and length of light waves = 633 nm we demonstrate that in a crystal the Gau ssian light beam is splitted into two beams. That beams spread symmetrically relative to the normal to the entrance edge of the sample. A feature of this process is the soliton formation in each of that beams. Process of spatial soliton formation is accompanied by scattering of light energy. The solitons cross-size a lot less than the width of the incident Gaussian beam, which was 30 micron in our calculations. Under such conditions soliton eigenmodes is formed in the BS0 and BT0 crystals with non-local photorefractive response. Keywords: spatial soliton, photorefractive crystal, optical anisotropy
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