分子内质子转移分子2-(2′-羟基苯基)间氮杂氧茚的光学非线性的研究  

Optical Nonlinearities of 2(2′Hydroxyphenyl)benzoxazole Based on Excited State Proton Transfer

作　　者：尚小明[1] 汤国庆[1] 张桂兰[1] 陈文驹[1] 杨斌洲[2] 张小秋[2] 

机构地区：[1]南开大学现代光学研究所 [2]中国科学院西安光学精密机械研究所瞬态光学技术实验室

出　　处：《光学学报》1997年第5期526-532,共7页Acta Optica Sinica

基　　金：国家科委攀登计划项目;中科院西安光机所瞬态光学技术实验室资助

摘　　要：报道了在调Ｑ的Ｎｄ∶ＹＡＧ激光器泵浦下用Ｚ扫描技术对具有分子内质子转移（ＥＳＩＰＴ）特性的分子２（２′羟基苯基）间氮杂氧茚（ＨＢＯ）的光学非线性的研究。结果表明：对１．０６μｍ的光，ＨＢＯ无非线性吸收，其三阶非线性极化率不随入射光强而变；而在０．５３μｍ的激光作用下，ＨＢＯ表现出显著的双光子吸收，其双光子吸收系数随泵浦光强增强而减小，而其三阶非线性极化率实部则随泵浦光强的增强而增大。在建立双光子泵浦产生激发态分子内质子转移动态模型的基础上。The studies of optical nonlinearities of 2 (2′ hydroxyphenyl)benzoxazole(HBO), based on excited state intramolecular proton transfer in cyclohexane solution using Z scan technique are reported. The results show that: (1) At 1.06 μm, HBO has no nonlinear absorption. And its real part of third order nonlinear susceptibility, χ (3) R is not dependent on the pumping intensity I 0; (2) with the irradiation at 0.53 μm, HBO exhibits evident two photon absorption (TPA). Its TPA coefficient decreases with increasing I 0, while its χ (3) R increases with increasing pumping intensity I 0. By establishing the ESIPT kinetic model of HBO based on TPA, we can explain the experiment satisfactorily.

关 键 词：2-(2′-羟基苯基)间氮杂氧茚 激发态分子内质子转移 非线性光学 

分 类 号：O631.2[理学—高分子化学] O437[理学—化学]