非相干耦合热电光伏光折变空间孤子对(英文)  

Incoherently Coupled Photorefractive Spatial Soliton Pairs Based on the Combination of Pyroelectric and Photovoltaic Effect

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：《光子学报》2014年第3期67-70,共4页Acta Photonica Sinica

基　　金：The Natural Science Foundation of Shanxi Province(No.2011011003-2);the Science and Technology Development Foundation of Higher Education of Shanxi Province(No.20111125)

摘　　要：基于无偏压光伏光折变晶体,理论研究了热电效应和光伏效应共同作用下的稳态空间孤子对.从非相干耦合波方程出发,推导了热电光伏孤子对的数值解;采用有限差分方法,数值模拟了各类孤子对的强度包络.结果表明:在自散焦光伏光折变晶体中,当正的热电场远大于光伏场时,亮-亮孤子对可以存在;当暗-暗或者灰-灰孤子对存在时,负的热电场可以增强自散焦效应,进而减小孤子的半峰全宽.各类孤子对的半峰全宽可以通过改变热电场的大小而加以操控.此外,非相干耦合热电光伏孤子对可以在一定条件下分别退化成热电孤子对或者光伏孤子对.借助晶体的热电效应,可以使光折变晶体LiNbO3从自散焦转变成自聚焦,从而灵活控制晶体中孤子对的特性.Steady-state spatial soliton pairs resulted from the combination of pyroelectric and photovoltaic effect were predicted for unbiased photovoltaic photorefractive crystals. The numerical solutions of pyroelectric photovoltaic soliton pairs were deduced theoretically based on the incoherent coupling wave equations. The intensity envelopes of soliton pairs were obtained by finite difference method. The results show that the bright-bright soliton pair can be established in self-defocusing photovoltaic crystals when the positive pyroelectric field is large enough compared with photovoltaic field. For the dark-dark and grey-grey soliton pairs, the negative pyroelectric field can enhance the self-defocusing nonlinear effect and reduce the full width at half maximum of soliton pairs. The full width at half maximum of soliton pairs can be controlled by adjusting the value of the pyroelectric field. Moreover, the pyroelectric photovoltaic soliton pairs can degenerate into pyroelectric soliton pairs or photovoltaic soliton pairs under a certain conditions. The characteristics of photorefractive crystal LiNbO3 can transfer from self-defocusing to self-focusing by virtue of the pyroelectric effects, which can help to control the characteristics of soliton pairs.

关 键 词：非线性光学 光折变空间光孤子 热电效应 光伏效应 孤子对 

分 类 号：O437[机械工程—光学工程]