Propagation and interaction of single and incoherently coupled nondiffracting beams in photorefractive medium with purely diffusion nonlinearity

We have numerically found profiles of (I + I)D single and incoherently coup led nondiffracting beams in the photorefractive medium with purely diffusio n nonlinearity. The main features of propagation and interaction of the non diffracting beams are analysed and it is shown that interactions in the med ium with diffusion nonlinearity are accompanied with the energy redistribut ion processes that can result in the fusion of the nondiffracting beams. (C ) 2001 Published by Elsevier Science B.V.