聚腈分子的飞秒时间分辨光克尔效应

The Femtosecond Time-Resolved Optical Kerr Effect of Polynitrile Molecules

本文利用飞秒时间分辨光克尔效应，对主链为C＝N结构的两种共轭聚腈高分子（聚氨基苯腈和聚硝基苯腈）的溶液和薄膜进行研究，所测得的时间分辨光克尔信号均表现为超快响应。测定出较大的材料三阶非线性极化率和相应的分子二阶超极化率，给出每种聚腈分子的二阶超极化率随其聚合度的增大而提高的大致规律。

Two kinds of polynitrile molecules (polyaminobenzonile and polynitrobenzonile) are studied by femtosecond time-resolved optical Kerr effect. The signals of both the solutions and films display ultrafast response. The third order nonlinear optical susceptibilities and second order hyperpolarizabilities are derived and the increaseing trend of the second order hyperpolarizability versus polymerization-degree is discussed.