Reflection of a Gaussian beam at a nonlinear interface

By numerical simulations of the reflection of a (2-D) Gaussian beam from a nonlinear interface, we show several new features of the behavior of such an interface and resolve the difference between the results of two previous studies of this type. Newly reported features include a very large nonlinear Goos-Hanchen shift and large variations of the angle of an output beam for small changes in the input intensity. The latter phenomenon has potential applications for a light-controlled angular scanning element. The differences between prior studies of this type are shown to be an artifact of the numerical procedures used.