Open AccessModel of anisotropic nonlinearity in self-defocusing photorefractive media
Author(s) -
Christopher Barsi,
Jason W. Fleischer
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.024426
Subject(s) - photorefractive effect , optics , nonlinear system , physics , nonlinear optics , anisotropy , self focusing , light beam , diffraction , lithium niobate , dwell time , crossover , laser beams , laser , computer science , quantum mechanics , medicine , clinical psychology , artificial intelligence
We develop a phenomenological model of anisotropy in self-defocusing photorefractive crystals. In addition to an independent term due to nonlinear susceptibility, we introduce a nonlinear, non-separable correction to the spectral diffraction operator. The model successfully describes the crossover between photovoltaic and photorefractive responses and the spatially dispersive shock wave behavior of a nonlinearly spreading Gaussian input beam. It should prove useful for characterizing internal charge dynamics in complex materials and for accurate image reconstruction through nonlinear media.