Abstract
Self-action of light beams in photorefractive waveguides is theoretically and experimentally investigated. We consider the waveguide formed by sequential diffusion of titanium and iron in Z-cut of LiNbO3 and the biased waveguide Bi12TiO20 on Bi12SiO20. It is shown that the spatial averaging of nonlinear change of refractive index is valid for different mechanisms of photorefractive effect. The wave equation in parax-ial approximation for evolution of beam amplitude shape is derived. We determine the conditions of the soliton formation for different waveguide modes taking into account two-dimensional distribution of optical field in guiding layer and the overlap integral of this field with the nonlinear changes in refractive index.
© 2003 Optical Society of America
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