Generalizing soliton description using spatiotemporal wave variables, we identify and experimentally validate the nonlinearity supporting quasi-steady-state solitons in biased photorefractive crystals for the one-dimensional case, the transient counterpart of the explicit one-dimensional screening soliton theory. The approach leads to a non-Kerr-like spatially local exponential nonlinearity and explicitly provides soliton existence conditions. These find quantitative agreement with a series of experiments in potassium lithium tantalate niobate and reproduce previously described transient behavior.
© 2006 Optical Society of America
Original Manuscript: April 24, 2006
Revised Manuscript: July 14, 2006
Manuscript Accepted: July 20, 2006
Eugenio DelRe and Elia Palange, "Optical nonlinearity and existence conditions for quasi-steady-state photorefractive solitons," J. Opt. Soc. Am. B 23, 2323-2327 (2006)