Optical interruptors based on total internal reflection of spatial solitons in saturable nonlinear interfaces

We study the reflection of one-dimensional spatial soliton at the nonlinear interface between a saturable type medium and linear medium. Our study mak es emphasis on determining the physical conditions under which the beam ref lected by the interface is still a spatial soliton. Depended the incidence angle we find,three critical regions for spatial solitons in the interface. We observed nonlinear Goos-Hanchen shift is determined if reflection angle are conserved. Finally, we present preliminar experimental results in SBN6 1:Ce of the total internal reflection of one dimensional beam.