Abstract
Photorefractive self focusing and self defocusing have attracted much interest in the past decade. Under illumination, photorefractive materials develop the property to exhibit a space charge field, which induces, due to the linear electro-optic effect (Pockels effect), non-linear changes in the refractive index of the material. This phenomenon is able to modify natural diffraction, allowing the optical beam to be self-focused ( or defocused) or to reach a spatial soliton. Such effects have been shown in SixBa1-xNb2O6 (SBN) and in Bi12TiO20 (BTO). We present an experimental approach in the study of these phenomena in two other photorefractive crystals: KNbO3, and LiNbO3:Fe.
© 2001 EPS
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