Separate Spatial Soliton Pairs in a Series Centrosymmetric and Non-Centrosymmetric Hybrid Photorefractive Crystal Circuit

摘要

This paper presents a new separate spatial soliton pair, which exists in a biased series photorefractive crystal hybrid circuit consisting of one centrosymmetric and one non-centrosymmetric photorefractive crystal, and the two crystals are connected by electrode leads in a chain with a voltage source. A system of two coupled equations is derived under appropriate conditions for two-beam propagation in the crystal circuit. The existence of dark-dark, bright-bright, and bright-dark soliton pairs in such a circuit is proved. Moreover, the interaction and dynamical evolution of the soliton pairs are analyzed by numerical methods.