All optical switching by total internal reflection in nonlinear interface of (2+1)D beams in SBN61:Ce

An experimental investigation of the dynamical, time depends effects in the reflection of (2+1)D beam at the nonlinear interface between photorefractive crystal SBN61:Ce and a linear medium is performed. Our study make emphasis on determining the physical condition under which the beam reflected by the interface is still a focusing beam.