偶氮掺杂液晶中热致光学非线性的测量

液晶与显示 , 2016, 31(2): 131-137. doi: 10.3788/YJYXS20163102.0131

偶氮掺杂液晶中热致光学非线性的测量

周鹏程 ^1, , 李燕 ^2, , 陈超平 ^3, , 李潇 ^4, , 刘澍鑫 ^5, , 袁亚超 ^6, , 荣娜 ^7, , 黄帅佳 ^8, , 王科宇 ^9,

1.上海交通大学电子工程系,上海,200240

2.上海交通大学电子工程系,上海,200240

3.上海交通大学电子工程系,上海,200240

4.上海交通大学电子工程系,上海,200240

5.上海交通大学电子工程系,上海,200240

6.上海交通大学电子工程系,上海,200240

7.上海交通大学电子工程系,上海,200240

8.上海交通大学电子工程系,上海,200240

9.上海交通大学电子工程系,上海,200240

基金项目: 上海市科委基金项目(13ZR1420000,14ZR1422300) National Natural Science Foundation of China(61307028,61405114) Shanghai Committee of Science and Technology(13ZR1420000,14ZR1422300) 973项目(2013CB328804) 国家自然科学基金(61307028,61405114) National Basic Research Program of China(2013CB328804)

关键词：三阶非线性效应 , 偶氮掺杂液晶 , 热效应 , 温度等效法 , 双路干涉法

Measurement of optical nonlinearity originating from photo-induced thermal effect for azo-dye-doped liquid crystal

Keywords： third-order optical nonlinearity , azo-dye doped liquid crystal , thermal effect , temperature equivalent method , double-beam interferometry

偶氮掺杂液晶具有非常强的三阶光学非线性,其非线性机理包括光致热效应等多种物理机理.为了测量偶氮掺杂液晶三阶光学非线性,本文采用非线性干涉法,定量测量了波长632.8 nm下,光强变化所引起的折射率改变.为了测量得到热效应对掺杂液晶非线性的贡献,我们提出了温度等效法,通过在暗室中加热掺杂液晶样品产生与光照时相同的温度变化,模拟出等效的热效应,从而将热效应从多种非线性机理中单独区分出来;通过测量此时的折射率改变,以及对应的温度和光强变化,得到了热效应导致的光学非线性.为了提高非线性干涉方法的灵敏度和消除环境震动带来的误差,本文采用了双路干涉的方法,使得测量精确性大为提高.测量结果表明:在波长632.8 nm下,掺杂液晶三阶非线性系数n2为0.268 cm2/W,其中热效应的贡献为0.091 cm2/W.

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