温度对双光子亮光伏空间孤子演化特性的影响  

Temperature effects on the evolution characteristics of two-photon bright photovoltaic spatial solitons

作　　者：苏艳丽[1] 姜其畅[1] 吉选芒[1] 

机构地区：[1]山西运城学院物理与电子工程系,山西运城044000

出　　处：《光学技术》2009年第5期657-659,共3页Optical Technique

基　　金：山西省高等学校科技开发基金资助项目(200611042)

摘　　要：基于扩散效应及暗辐射强度对温度的依赖关系,研究了温度对双光子光伏光折变介质中亮光伏空间孤子动态演化及自偏转特性的影响。将亮孤子作为入射孤子波,采用数值方法求解孤波演化方程,结果表明:在给定温度下,双光子光折变介质中可以形成稳定的亮光伏空间孤子,当介质的温度变化不大时,孤子将克服较小的扰动而保持稳定的孤子传播,当温度变化足够大时,孤子将变得不稳定甚至崩溃;在一定温度范围内,孤子中心的自偏转距离随着温度的升高而增加,在特定温度下达到最大值,之后随着温度的升高而减小。Temperature effects on the dynamical evolution and self-deflection characteristics of bright photovoltaic spatial solitons in two-photon photovoltaic photorefractive media are investigated by taking into account the temperature dependence of both diffusion effects and dark irradiation.Taking the bright solitons as the input solitary beam,numerically solving the beam propagation equation,it is found that,a stable bright photovoltaic spatial solitons can be formed in a crystal at a given temperature.When the temperature of crystals is changed in a less range,the stability of solitons can be persisted by overcoming the less perturbation.Solitons will become unstable or collapse when temperature of crystals is changed in a large range.The results show that the bending distance of the bright solitary beam centre increases with temperature rise,then reaches its maximum value at a specific temperature,and after that,decreases as temperature continuously rises.

关 键 词：非线性光学 双光子光伏光折变介质 自偏转 温度特性 

分 类 号：O437[机械工程—光学工程] TN929.11[理学—光学]