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Excited-state absorption optical limiting of a novel organic polymer

机译：新型有机聚合物的激发态吸收光学极限

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Abstract: The optical limiting response and excited-state absorption properties of a novel organic polymer (poly(5-2-methythio-4- methyl-5-pyrimidinyl)-2,4-pentadine-1-ol)-p-toluene sulfinate) in chloroform solvent have been investigated and its solutions almost have no absorption in visible spectral range. A Nd:YAG laser source with 8-ns/21-ps pulse width and 532-nm wavelength was employed. The pulse-width-dependent measurements indicated that the optical limiting mechanism is excited state absorption along with nonresonant two photon absorption. The open aperture Z-scan was also performed to measure the molecular excited state absorption coefficient. The nanosecond optical limiting behavior of the various concentration solution samples with nominal transmissions of 87%, 56% and 26% have been measured as a function of the beam fluence. The theoretical fitting result of excited state cross section can be fitted on the mode that excited-state absorption is the predominant mechanism causing the observed optical limiting behavior.!12
机译：摘要：新型有机聚合物（聚（5-2-甲硫基-4-甲基-5-嘧啶基）-2,4-戊二-1-醇）-对甲苯亚磺酸盐的光学极限响应和激发态吸收特性）在氯仿中的溶剂已经过研究，其溶液在可见光谱范围内几乎没有吸收。使用具有8ns / 21ps脉冲宽度和532nm波长的Nd：YAG激光源。取决于脉冲宽度的测量结果表明，光学限制机制是激发态吸收以及非共振的两个光子吸收。还进行了开孔Z扫描以测量分子激发态吸收系数。根据光束通量测量了标称透射率为87％，56％和26％的各种浓度溶液样品的纳秒光学极限行为。激发态横截面的理论拟合结果可以拟合为以下模式：激发态吸收是导致观察到的光学极限行为的主要机制。12

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