Abstract

In this paper, we used numerical simulations to investigate the propagation behavior of (1+1)-dimensional bright spatial solitons at the interface formed by two photovoltaic (PV) photorefractive (PR) crystals with opposite diffusion effects. When the incident direction of the soliton beam is parallel to the interface with an appropriate structure, the soliton beam follows a wiggling trajectory and passes periodically through the interface under the co-influence of two opposite diffusion effects. Moreover, the intensity of the soliton beam slightly oscillates during propagation at a composite frequency containing a low-frequency component and a high-frequency component. Furthermore, when the incident direction of the soliton beam coincides with the interface, the soliton beam moves along a straight line, and the self-deflection that arises from the diffusion effect is suppressed. These results provide what we believe is a feasible method to control the propagation trajectory of soliton beams in PV PR crystals.

© 2016 Optical Society of America

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