利用法布里—珀罗效应研究PPQ共轭有机聚合物薄膜中的非线性光学效应

采用飞秒激光脉冲研究聚苯基喹恶啉共轭有机高聚物薄膜中由法布里－珀罗效应产生的光谱的干涉条纹结构，并通过改变脉冲的峰值功率，测到的光谱条纹结构的变化，说明是依赖光强的非线性折射率的变化引起了干涉条纹的改变，通过平均功率不变只改变脉冲峰值功率方法，验证了热效应在干涉条纹的变化中不起主导作用。

Observation of Nonlinear Optical Effects in Organic Polymer Film by the Meaning of F-P Effect

We use femosecond laser pulse to study the fringe variation on the spectrum of pulse due to F-P effect in PPQ organic polymer film. By changing the pulse peak intensity, the fringe variation is observed evidently, while fringe variation is not observed at broadened pulse duration and the same average power. It shows that the thermal effect is no greater contribution to the refractivity, the main reason that leads to fringe variation on the spectrum can be attrivuted to the nonlinear refractive index change of PPQ film due to high pulse peak intensity.