Propagation of laser beams in photonic crystals with cubic non-linearity

摘要

It has been investigated the influence of cubic optical non-linearity and derivative of group velocity on laser beam divergence by the propagation in one-dimentional photonic crystal which is layered periodic structure formed by anisotropic media. It has been established that the laser beam divergence is determined by two physical mechanisms: influence of non-linearity and scattering on diffractional grating appearing in the crystal because the presence of periodicity of optical properties. It has been shown that the second mechanism may become the reason of strengthening the focusing. . It has been analyzed the influence of low- frequency electric field on this phenomenon. It has been found the conditions of non-diffractional beam propagation in photonic nonlinear crystal.