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Model of amplified scattering in photorefractive media: comparison of numerical results and experiment.

We implement a random-walk scattering model in a nonlinear beam-propagation code to simulate fanning in photorefractive crystals. The characteristics of the scatterers were verified by comparisons of the measured firstorder statistics of the scattered intensity with a theoretical expression of the probability-density function based on a random-walk scattering model. Both the size and the separation of the scatterers can be varied, enabling us to tailor our numerical simulations to experimental measurements of nonamplified and amplified scattering. We show that a one-dimensional model does not accurately simulate amplified scattering for crystals with a nondiagonal electro-optic tensor and that surface scattering alone may not account for the angular dependence of the amplified scattering distributions.