Three-Dimensional Scalar Time Dependent Photorefractive Beam Propagation Model

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Abstract
This paper presents an open-source time dependent three-dimensional scalar photorefractive beam propagation model (PRProp3D) based on the well-known split step method. The angular spectrum method is used for the diffractive steps and the nonlinearities accumulated at the end of each diffractive step are applied using spatially varying phase screens. Comparisons with previously published experimental results are given for image amplification and photorefractive amplified scattering (fanning). Artifacts can be mitigated by use of step sizes less than 5~10 micrometers and by careful choice of the transverse computation grid size to ensure adequate sampling. The occurrence of wraparound effects associated with the use of discrete Fourier transforms is discussed.
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