光学学报, 1997, 17 (5): 526, 网络出版: 2006-10-31
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
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 2-(2′-hydroxyphenyl)benzoxazole excited state intramolecular proton transfer nonlinear optics
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1.06 μm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0.53 μm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,通过理论计算很好地解释了实验现象。
Abstract
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 I0; (2) with the irradiation at 0.53 μm, HBO exhibits evident two photon absorption (TPA). Its TPA coefficient decreases with increasing I0, while its χ(3)R increases with increasing pumping intensity I0. By establishing the ESIPT kinetic model of HBO based on TPA, we can explain the experiment satisfactorily.
尚小明, 汤国庆, 张桂兰, 陈文驹, 杨斌洲, 张小秋. 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[J]. 光学学报, 1997, 17(5): 526. 尚小明, 汤国庆, 张桂兰, 陈文驹, 杨斌洲, 张小秋. Optical Nonlinearities of 2-(2′-Hydroxyphenyl)benzoxazole Based on Excited State Proton Transfer[J]. Acta Optica Sinica, 1997, 17(5): 526.