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液晶稳态和瞬态多波混频与非线性光学特性
引用本文:苗明川,徐则达,侯钢,樊尚春. 液晶稳态和瞬态多波混频与非线性光学特性[J]. 物理学报, 2005, 54(10): 4776-4781
作者姓名:苗明川  徐则达  侯钢  樊尚春
作者单位:(1)北京航空航天大学电子中心,北京 100083; (2)北京航空航天大学物理系,北京 100083; (3)北京航空航天大学物理系,北京 100083;北京航空航天大学仪器科学与光电工程学院,北京 100083; (4)北京航空航天大学仪器科学与光电工程学院,北京 100083
基金项目:世界银行贷款项目资助的课题.
摘    要:在掺杂(~3%重量比)碳纳米管和光敏取向基团的向列态液晶薄膜(5μm厚)中,在使用Ar+(514.5nm)为激发光做前向多波混频实验时,观察到7级的自衍射和探测光He-N e(632.8nm )的多级衍射均呈多环状结构.高斯光束中心处的光致非线性折射率系数δn~0.8. Ar+ (514.5nm)连续光形成光栅的时间和弛豫时间都与写入光的偏振态强烈相关.在使用Nd :YAG(532 nm)为激发光时,光栅的弛豫时间~200ms量级,且探测光He-Ne(632.8nm)的o光和e光所探 测到的动力学响应曲线是不同的.关键词:瞬态稳态多波混频液晶

关 键 词:瞬态  稳态  多波混频  液晶
文章编号:1000-3290/2005/54(10)/4776-06
收稿时间:2004-10-11
修稿时间:2004-10-112005-01-31

Transient and steady-state multi-wave nonlinear optical properties of liquid crystal film
Miao Ming-Chuan,Xu Ze-Da,Hou Gang,Fan Shang-Chun. Transient and steady-state multi-wave nonlinear optical properties of liquid crystal film[J]. Acta Physica Sinica, 2005, 54(10): 4776-4781
Authors:Miao Ming-Chuan  Xu Ze-Da  Hou Gang  Fan Shang-Chun
Abstract:Transient and steady-state multi-wave mixing experiments are carried out on the novel azo+c-tube liquid crystal sample. The shape of the diffracted multi-wave consists of rings under Ar(514.5nm) laser pump light, and th e nonlinear refractive index is n~0.8. Using different polarization states of the pump laser light field, different reorientation models of liquid crystal molecules ar e observed. On the other hand, a Nd:YAG(532nm)pulsed laser is used, polarizati on holographic gratings are detected by a He-Ne (632.8nm)laser beam. Different p rocesses of liquid crystal molecular reorientation are also detected using the o -light beam and e-light beam of a He-Ne (632.8nm)laser.
Keywords:liquid crystal   stable   transient   multi-wave mixing
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