Model of anisotropic nonlinearity in selfdefocusing photorefractive media

C. Barsi, J. W. Fleischer

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We develop a phenomenological model of anisotropy in selfdefocusing 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.

Original languageEnglish (US)
Pages (from-to)24426-24432
Number of pages7
JournalOptics Express
Issue number19
StatePublished - 2015

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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