【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-Ne(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NdYAG(532nm)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.更多还原

【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 the nonlinear refractive index is n～0.8. Using different polarization states of the pump laser light field, different reorientation models of liquid crystal molecules are observed. On the other hand, a Nd:YAG(532nm)pulsed laser is used, polarization holographic gratings are detected by a He-Ne (632.8nm)laser beam. Different processes of liquid crystal molecular reorientation are also detected using the o-light beam and e-light beam of a He-Ne (632.8nm)laser.更多还原