MODEL OF AMPLIFIED SCATTERING IN PHOTOREFRACTIVE MEDIA - COMPARISON OF NUMERICAL RESULTS AND EXPERIMENT

We implement a random-walk scattering model in a nonlinear beam-propag ation code to simulate fanning in photorefractive crystals. The charac teristics of the scatterers were verified by comparisons of the measur ed first-order statistics of the scattered intensity with a theoretica l expression of the probability-density function based on a random-wal k scattering model. Both the size and the separation of the scatterers can be varied, enabling us to tailor our numerical simulations to exp erimental measurements of nonamplified and amplified scattering. We sh ow that a one-dimensional model does not accurately simulate amplified scattering for crystals with a nondiagonal electro-optic tenser and t hat surface scattering alone may not account for the angular dependenc e of the amplified scattering distributions.