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以对位取代苯乙烯碘化吡啶为体系,进行了“D-π-A”型化合物分子内电荷转移（ICT）与双光子吸收效应关系的研究.在锁模Nd:YAG脉冲激光器（1064nm,40 ps脉宽）抽运下,通过开孔Z-扫描技术测量双光子吸收截面、双通道能量计测试输入/输出（或透过）曲线和双光子上转换激射效率、条纹相机记录双光子荧光寿命和双光子上转换激射谱等测试方法,系统研究了双光子机制导致的双光子吸收效应,如光限幅特性、双光子上转换荧光及双光子上转换激射等光物理性能,并结合理论计算研究了激发态分子内电荷转移对双光子吸收截面的影响.
The relationship between the intramolecular charge transfer (ICT) and the two-photon absorption effect of “D-π-A” type compound has been studied by using para-substituted styrylpyridinium iodide as a system. In the mode-locked Nd: YAG pulsed laser (1064nm, 40 ps pulse width) Two-photon absorption cross section measured by open-hole Z-scan technology, dual channel energy meter Test input / output (or transmission) curve and two-photon up-conversion lasing efficiency, Fluorescence lifetime and two-photon up-conversion lasing spectrum were used to systematically study the two-photon absorption effect caused by two-photon mechanism, such as optical limiting properties, two-photon upconversion fluorescence and two-photon up-conversion lasing. The influence of the charge transfer in the excited state on the two-photon absorption cross-section was studied by theoretical calculations.