Self-trapping of one-dimensional and two-dimensional optical beams and induced waveguides in photorefractive KNbO(3).

We demonstrate self-trapping of one-dimensional and two-dimensional optical beams in a photorefractive KNbO(3) crystal. We study the waveguides induced by the self-trapped beams for prospective applications of tunable nonlinear frequency conversion in soliton-induced waveguides.