用非简并泵浦探测方法研究C70/甲苯溶液的激发态吸收动力学

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532 nm波长的皮秒激光脉冲泵浦下，用600 nm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。

Study of excited state absorption of C70/toluene solution using time resolved non degenerate pump probe system

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 duration 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 unchanged under non degenerate condition, but the absorption cross section of the first excited state decreases with probe beam wavelength increase.