The Temperature Dependence Of Separate Spatial Soliton Pairs In An Series Two-Photon Photorefractive Crystal Circuit

A light beam can propagate in a media as soliton with its intensity profile unchanged when the self-focusing of a light beam inside the photorefractive material exactly balances the diffraction of the beam. For decades, photorefractive solitons have attracted much interest for its useful potential applications, including optical processing, all-optical switch, beam steering, optical interaction, optical computation.This article describes the coupled theory of spatial soliton in the two-photon photorefractive crystal circuit, based on Castro-Camus model, and deduced the coupling coefficient expressions for the screening two-photon photorefractive crystal circuit. The temperature dependence are also discussed.The separate spatial soliton pair, formed in a serial PR crystal circuit consisting of two photorefractive crystals connected by electric leads with or without a biased source, is predicted. Three sorts of separate soliton pair can be formed in the circuit, right-bright, bright-dark and dark-dark. The two solitons in one pair can interact with each other. When in the limit of the spatial extent of the optical wave being much less than the width of the crystal, the dark soliton can affect the other one and the bright soliton also can. We can conclude that: Considering of the temperature dependence, the series circuit through the coupling of dark soliton can affect the bright and dark soliton; the same time can also affect the light of a bright soliton and dark soliton. This is different from the case without considering the temperature dependence that the bright soliton can not affect the bright and dark soliton behavior. The reason is the great influence of temperature on the crystal dark radiation intensity. Photorefractive spatial solitons due to dielectric photorefractive effect, Medium dark radiation play a role in the process of photorefractive. Therefore, dark radiation affects the formation of photorefractive soliton. The temperature also has some influence for photorefractive solitons, and we get the different solution. At the same time, we discussed the evolution properties of the beam in the series circuit with two-photon screening photovoltaic photorefractive crystal. We also numerically simulated the process of soliton coupling dependence in series two-photon photorefractive crystals circuit.