Concentration dependence of two-photon absorption and subsequent excited-state absorption in acetone solution of 4-methoxy-2-nitroaniline
首发时间:2009-03-13
Abstract:By performing both open-aperture Z-scan and transient transmission measurements with femtosecond laser pulses in the near infrared region, the concentration dependence of two-photon absorption (2PA) and subsequent excited-state absorption (ESA) are investigated in acetone solution of 4-methoxy-2-nitroaniline (4M2N). Owing to the high tendency of forming aggregation molecules in solution, a considerable dependence of the nonlinear optical response on the concentration is observable at a 4M2N concentration of 10$^{-3}$ M and beyond. It is found that both 2PA and ESA cross-sections decrease with increasing concentration, while the lifetime of 2PA-induced excited state lengthens.
keywords: Two-photon absorption,excited-state absorption,Optical nonlinearities in organic materials
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研究4-甲氧基-2-硝基苯胺/丙酮溶液中浓度依赖的两光子吸收和其后的激发态吸收
摘要:应用近红外飞秒脉冲激光激发下的Z-扫描和瞬态吸收测量实验,研究了4-甲氧基-2-硝基苯胺(4M2N)/丙酮溶液中浓度依赖的两光子吸收和其后的激发态吸收效应。归功于在溶液中形成了很强的分子聚集,4M2N的浓度超过10$^{-3}$ M时可观测到浓度依赖的非线性响应。研究发现随着浓度的增加,两光子吸收截面和激发态吸收截面减小,而两光子感应激发态的寿命延长
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研究4-甲氧基-2-硝基苯胺/丙酮溶液中浓度依赖的两光子吸收和其后的激发态吸收
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