液晶与显示, 2010, 25 (5): 661, 网络出版: 2010-11-04
强激光诱导液晶衍射环现象的实验与数值研究
Propagation of High Power Laser Beam in Nematic Liquid Crystal and Its Diffraction Ring Effect
非线性光学 向列相液晶 衍射环 基尔霍夫衍射积分 光致折射率变化 nonlinear optics nematic liquid crystal diffraction rings Kirchhoff's diffraction integral optical-induced refractive index change
摘要
强激光在液晶材料中传输时易诱导非线性效应, 这种非线性效应对液晶器件光学性能有一定影响。高斯光束通过平行排列的5CB液晶材料后产生自衍射图像, 利用高速相机对不同光强的532 nm激光通过5CB液晶后的衍射图样成像, 获得了从激光作用瞬间到液晶温度达到清亮点附近时衍射图样的变化过程。通过衍射图样对液晶材料光致折射率变化的性质进行了分析。利用基尔霍夫衍射积分公式数值模拟研究了相应强度532 nm高斯光束通过非线性液晶材料后在衍射屏上的衍射图样, 并与实验结果进行了比对, 定性分析了液晶非线性对液晶器件性能的影响。
Abstract
High power laser induced nonlinear optical effects in liquid crystal are prone to deteriorate the optical properties of liquid crystal device. The self diffraction phenomenon was observed when high power Gaussian profile laser beam propagate in 5CB liquid crystal, which was taken by high speed camera. The dynamical evolution of the diffraction phenomenon was studied to analyze the nonlinear optical properties of the liquid crystal. Kirchhoff's diffraction integral was applied to study the diffraction rings induced by Gaussian profile laser beam propagating in self-defocusing medium numerically. The comparison of experimental result with theoretical result elucidates the nonlinear effect of liquid crystal.
赵祥杰, 骆永全, 王海峰, 罗飞, 刘海涛, 张大勇. 强激光诱导液晶衍射环现象的实验与数值研究[J]. 液晶与显示, 2010, 25(5): 661. ZHAO Xiang-jie, LUO Yong-quan, WANG Hai-feng, LUO Fei, LIU Hai-tao, ZHANG Da-yong. Propagation of High Power Laser Beam in Nematic Liquid Crystal and Its Diffraction Ring Effect[J]. Chinese Journal of Liquid Crystals and Displays, 2010, 25(5): 661.
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