含硫芴基的三苯胺多枝衍生物的光限幅特性  

Optical Limiting of Triphenylamine-Based Chromophores Containing Dibenzothiophene

作　　者：王筱梅[1] 罗建芳[1] 王晓宏[1] 陶绪堂[2] 

机构地区：[1]苏州科技学院化学与生物学院,江苏苏州215009 [2]山东大学晶体材料国家重点实验室,山东济南250100

出　　处：《中国激光》2010年第10期2599-2604,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(50673070;50973077);教育部科技重点项目(204053);苏州市国际合作项目(SWH0616);苏州市科技发展项目(SYJG0931)资助课题

摘　　要：强双光子吸收有机分子在激光光限幅领域具有重要应用价值。通过测量纳秒脉冲下输入/输出光强的变化、纳秒/飞秒抽运下分子的双光子吸收以及单光子荧光衰减曲线,研究了一系列含硫芴基的三苯胺衍生物对纳秒激光的限幅特性与机制。结果表明,分子激发态寿命与激光脉宽在同一量级有助于激发态再吸收;具有长激发态寿命的多枝形分子其激发态再吸收更明显、表观双光子吸收截面显著增大,有利于提高分子的激光限幅效率。Materials with large two-photon absorption（TPA） cross sections have the potential applications such as optical power limiting.Herein,the optical limiting of a series of multibranched chromophores based on triphenylamine is reported,and the comparative study of their two-photon absorption property pumped by 800 nm nanosecond and femtosecond laser pulses,associative with the fluorescence lifetime on the one-photon excitation,is performed.Results show that,with higher generation,multibranched molecules possess longer excited lifetime and stronger re-absorption on the excited state.Thus,the effective two-photon absorption cross-section pumped by nanosecond laser pulse is larger.As a result,larger optical limiting efficiency is obtained.

关 键 词：非线性光学 双光子吸收 激光限幅 激发态再吸收 硫芴 三苯胺多枝分子 

分 类 号：O436[机械工程—光学工程]