温度对闭路光伏明空间孤子演化和自偏转的影响(英文)  

Effects of temperature on evolution and self-deflection of bright photovoltaic spatial solitons in closed-circuit realization

作　　者：张光勇[1] 刘劲松[1] 刘时雄[1] 

机构地区：[1]华中科技大学光电子科学与工程学院激光技术国家重点实验室

出　　处：《应用光学》2007年第2期240-244,共5页Journal of Applied Optics

基　　金：国家自然科学基金(10574051和10174025);中国地质大学(武汉)优秀青年教师资助计划(CUGQNL0621)

摘　　要：通过考虑扩散效应的影响,采用数值方法研究了温度对光伏光折变介质中的明空间孤子演化和自偏转的影响。结果表明,当晶体温度变化时,明孤子可以呈现为稳定态、较大周期的压缩和膨胀态,或塌陷态。同时,明空间孤子中心偏转距离随温度增加而增加,在一个特定温度处达到最大值,之后随温度增加而减小,在高温和低温区域此偏转距离趋于零。孤子的最大偏转距离和对应的特定温度随入射孤子波强度的增加而增加。进一步采用微扰方法研究了明孤子自偏转过程,其结果与数值方法获得的结果一致。The effects of temperature on the evolution and self-deflection of bright photovoltaic spatial solitons in photovoltaic photorefractive media are investigated with numerical method by taking account of diffusion effect. It is found that the bright solitary beam appears in stable state, large periodic compression and expansion state, or breakdown state when the crystal temperature changes. 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 ; it approaches zero at low and high temperature ranges. The maximum deflection value and its corresponding specific temperature increase as the intensity of incident solitary wave increases. The self-deflection process of the bright solitary beam is further studied with the perturbation technique, and the results indicate that the values agree with those obtained from the numerical method.

关 键 词：空间光孤子 光折变效应 光伏效应 自偏转 

分 类 号：TN304.01[电子电信—物理电子学] O437.5[机械工程—光学工程]