Abstract
Photorefractive spatial solitons can exist in crystals like SBN, BTO and LiNbO3 at light powers of a microwatt range. It makes such solitons a promising candidate for all-optical information technology. The photovoltaic effect in LiNbO3 results in the self-defocusing nonlinearity and dark photovoltaic spatial solitons have already been observed in bulk LiNbO3. Optical waveguides in LiNbO3 with their surface doping by impurities like Fe and Cu can show much higher photorefractive nonlinearity with respect to bulk material and this nonlinearity may be strongly inhomogeneous over a waveguide depth. Besides, waveguides allow simultaneous propagation of several guided modes in the same direction. All that may result in the considerable features of spatial solitons in similar planar waveguides.
© 2000 IEEE
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