推拉型偶氮化合物三阶非线性电极化率测量

Measurement of Third-order Nonlinear Susceptibility in Push-pull Azobenzene Compounds

本工作报道了由皮秒激光和 Z-扫描技术在两种推拉型偶氮化合物 ,对硝基苯偶氮 - N,N—二甲基苯胺 ( NPADMPA)和对硝基苯偶氮— N—甲基苯胺( NPAMPA)的非共振吸收区测量与三阶非线性电极化率 χ[3 ] 有关的非线性折射率 n2 。测得的 n2 值分别为2 .2× 10 -8esu和 1.81× 10 -8esu。根据分子结构特征对这两种三阶非线性光学材料的结构与性能的关系作了讨论。

The nonlinear refractive index n 2 of two kinds of self made push pull azobenzene compounds,P nitrophenylazo N,N dimethyl phenylamine(NPADMPA) and P nitrophenylazo N methyl phenylamine(NPAMPA), have been measured with the Z scan technique and the PS laser.The measured values are respectively 2.2×10 -8 esu 1.81×10 -8 esu. The relations between the structure and property of the nonlinear optical materials were discussed.