【摘要】 采用旋涂法制备了一种五甲川花菁染料的超薄膜,利用激光诱导瞬态光栅的方法研究染料薄膜的三阶,乃至更高阶的非线性光学特性。通过理论计算得到了该样品在不同浓度下的非线性光学信号的响应时间（59～102 ps）,分析表明花菁染料五甲川链上的π-π^*电子跃迁是引起该染料薄膜非线性光学效应(20.5×10^-13esu～30.3×10^-13esu)的主要原因。研究结果表明激光诱导瞬态光栅是研究介质高阶非线性光学特性一种非常有意义的实验方法。更多还原

【Abstract】 Higher order nonlinear susceptibilities of the cyanine dye PC films on the silica substrates deposited by spin-coating technique,are investigated by means of the laser-induced transient grating（TG）technique.The third-order nonlinear susceptibilities are measured to be 20.5×10^-13esu～30.3×10^-13esu,and the response times are 59～102 ps at different concentrations.Their nonlinear response can be due to the conjugateπelectronics of the pentamethine chain.The results show that the laser-induced transient grating has a potential application on investigating higher order nonlinear optical properties.更多还原