Lu Keqing et al 2001 J. Opt. A: Pure Appl. Opt. 3 262 doi:10.1088/1464-4258/3/4/306
Lu Keqing1,2, Zhang Yanpeng2, Tang Tiantong2 and Hou Xun3
Show affiliationsA theory on spatial solitons in photovoltaic (PV)-photorefractive (PR) crystals for short circuits is developed that gives rise to spatial solitons due to both a bulk PV effect and spatial nonuniform screening of the external field. When the PV effect is neglected these solitons are screening solitons. When the external field is absent these solitons are PV solitons in short and open circuits and it is predicted that grey solitons exist in PV-PR crystals for short circuits. We also show theoretically that PV nonlinearity can be switched from self-defocusing to self-focusing (or vice versa) by adding the external field.
42.65.Tg Optical solitons; nonlinear guided waves
42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
42.65.Pc Optical bistability, multistability, and switching, including local field effects
Issue 4 (July 2001)
Received 8 March 2000, in final form 19 April 2000
Lu Keqing et al 2001 J. Opt. A: Pure Appl. Opt. 3 262
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