用非简并泵浦探测方法研究C_(70)/甲苯溶液的激发态吸收动力学  

Study of excited-state absorption of C_(70)/toluene solution using time-resolved non-degenerate pump-probe system

作　　者：张磊[1] 李中国[2] 聂仲泉[2] 杨俊义[1,3] 宋瑛林[1] 

机构地区：[1]苏州大学物理科学与技术学院,江苏苏州215006 [2]哈尔滨工业大学物理系,哈尔滨150001 [3]欧贝黎新能源科技股份有限公司,江苏南通226612

出　　处：《强激光与粒子束》2013年第2期495-499,共5页High Power Laser and Particle Beams

基　　金：江苏省自然科学基金青年基金项目(BK2012178);国家自然科学基金项目(90922007)

摘　　要：通过非简并的时间分辨泵浦探测技术对C70富勒烯/甲苯溶液的非线性光学性质进行了研究。在532nm波长的皮秒激光脉冲泵浦下,用600nm的皮秒激光脉冲测量了C70富勒烯的激发态非线性吸收动力学响应。利用五能级模型对实验结果进行了数值模拟,得到了非简并情况下C70富勒烯分子的光物理参数。实验结果表明:C70富勒烯在简并和非简并情况下的激发态寿命没有变化,但非简并情况下的单重态吸收截面要比简并情况下单重态吸收截面小。The excited-state nonlinearities of the C70/toluene solution are studied using a time-resolved non-degenerate pump probe system. The 532 nm laser beam with 21 ps duration is used as the excitation and the laser beam of 600 nm with 10 ps dura- tion is used for probing. The parameters associated with the five-energy-level model are evaluated by numerically simulation based on the non-degenerate pump-probe theory. The experimental results demonstrate that the lifetime of the excited state remains un changed under non-degenerate condition, but the absorption cross section of the first excited state decreases with probe beam wavelength increase.

关 键 词：激发态吸收 泵浦探测 非简并 五能级模型 

分 类 号：O437[机械工程—光学工程]