Abstract
It was recently reported [G.F. Calvo et al. Phys. Rev. Lett. 84, 3839 (2000)] that strong nonlinearities in the light-induced space-charge field can arise in photorefractive materials when an AC field is applied. The effect of this phenomenon on the propagation of a single Gaussian beam in a BSO crystal is investigated. We model this process by using a modified split step beam propagation method combined with the solution of the found nonlinear material equation that describes the space-charge field profile. Our numerical simulations show that the strong transverse gradients of the light-induced refractive index give rise to the filamentation of the beam.
© 2001 Optical Society of America
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