Abstract

Previous simulations of nonplanar beam propagation in photorefractive media^1-4 have used the generally accepted single-carrier, deep trap photorefractive model. Several researchers have observed photorefractive effects that exhibit a sublinear intensity dependence, in addition to also noting an intensity-dependent absorption. These results have been explained in various ways, but in general they include some combination of a multilevel interaction with either hole or electron carriers or with both hole and electron carries. A multilevel model was recently proposed to account for the non-90° phase shift measured in BaTiO₃ crystals.

© 1995 Optical Society of America