Abstract

The space-charge field of the photorefractive grating in planar waveguides in cubic crystals is considered. Analytical expressions are derived from three cases: the initial stage of photorefractive grating formation, the steady state, and the photorefractive grating formation in waveguides with a short diffusion length and high dark conductivity and without trap saturation. The orientation dependencies of the waveguiding two-beam coupling factor for the (110), the (111), and the (100) cuts of the substrate are considered. The overlap factors of the cross distributions of the space-charge field and the light field of the waveguide modes are calculated for waveguides with a step-shaped profile of the refractive index.

© 1994 Optical Society of America

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