Abstract
Photorefractive spatial solitons form when the optically induced space-charge field modifies the refractive index via electro-optic effect and forms a waveguide that confines the optical beam that has induced the waveguide. Since the photorefractive response is wavelength-dependent, one can generate a soliton with a weak beam and guide in it a more intense beam of a less-photosensitive wavelength. Here we present theoretical and experimental studies of the waveguides induced by photorefractive screening solitons. We show that the number of guided modes in a waveguide induced by a bright screening soliton increases monotonically with increasing intensity-ratio (the ratio between the peak soliton intensity and the background or dark irradiance) whereas the waveguides induced by dark screening solitons are always single-mode waveguides.
© 1998 Optical Society of America
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