Abstract
Light-beam profile deformation during scattering with the pho- torefractive grating formed by the diffusive, photovoltaic, and drift mechanisms is investigated in the case of anisotropic Bragg diffraction for the incident light with arbitrary spatial beam profile under the frame- work of a three-dimensional configuration. A set of three-dimensional coupled-wave equations that can properly describe the interaction is de- rived from Maxwell's equations. In the wave equations, the permittivity profile, which is perturbed by the diffusive, photovoltaic, and drift mecha- nisms, can be correctly plotted by employing Kukhtarev's material model. Using a spatial Fourier transform technique identical to the one used in deriving the spatial transfer function from the paraxial wave equation for free-space propagation, a steady-state solution for the out- put light beams diffracted by this initially stored grating can be calculated in the spatial frequency domain. The nature of the dependence of beam profiles on the material properties, sample thickness, and incident angle, under the combined effects of propagational diffraction, diffusion, photo- voltaicity, and drifting, is presented. © 1998 Society of Photo-Optical Instrumen- tation Engineers. (S0091-3286(98)03501-6)
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