向列相液晶中强非局域空间光孤子的实验观察  

Experimental Observation of Strong Nonlocal Optical Spatial Solitons in Nematic Liquid Crystals

作　　者：张涛[1] 胡巍[1] 龙学文[1] 郭旗[1] 刘海英[1] 王新爱[1] 

机构地区：[1]华南师范大学广东省高校光子信息技术重点实验室

出　　处：《光学学报》2007年第1期143-147,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60278013;10474023);国家863计划基金(863-804-5);广东省自然科学基金重点项目(04105804)资助课题

摘　　要：通过实验对向列相液晶中的非局域空间光孤子的传输进行了研究。理论上基于非线性的液晶孤子传输方程,采用高斯形式的试探解,得到了孤子传输的解析解,以及对液晶中的非局域孤子和Snyder等提出的强非局域孤子模型的结果进行了比较。实验上,观察了空间光孤子在向列相液晶中的传输,找到了不同束宽下空间光孤子的临界功率。比如束宽为2μm时临界功率为2.0mW。观察了向列相液晶中空间光孤子的弛豫过程,并注意到液晶分子的响应时间长达几秒钟,液晶中的孤子形成速度较慢。The propagation of nonlocal spatial solitons in nematic liquid crystals is studied experimentally. On the basis of propagation equation of nonlinear nematic liquid crystals solitons, we obtain the analytical solution of solitons by using Gaussian trial solution and compare our model with Snyde＇s strong nonlocal solitons model. In experiment, we observe the propagation of solitons in nematic liquid crystals, and determine the critical power of optical spatial solition in different beam width, for example, when the beam width is 2 μm, the critical power is 2.0 mW. The relaxation process of optical solitons in nematic liquid crystals is discovered and it is noticed that the molecule of nematic liquid crystals takes several seconds to respond, and the generation of optical solition is not fast.

关 键 词：非线性光学 非局域非线性 空间孤子 向列相液晶 呼吸子 临界功率 

分 类 号：O437.5[机械工程—光学工程]