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首页> 外文期刊>Journal of the Optical Society of America, B. Optical Physics >Nonlinear light absorption of polymethine dyes in liquid and solid media
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Nonlinear light absorption of polymethine dyes in liquid and solid media

机译：液体和固体介质中聚次甲基染料的非线性光吸收

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We investigate nonlinear optical absorption of a series of polymethine dyes in liquid solution and in a solid poly(urethane acrylate) elastopolymer host. Depending on the ratio between the absorption cross section from the ground to the first excited state (sigma(01)) and from the first to the higher excited states (sigma(12)) and on the pump wavelength, they demonstrate absorption that either increases or decreases with increasing incident energy density. Our interest is directed at studying the optical Limiting behavior of the dyes for sensor protection applications, which requires that sigma(12) be greater than sigma(01). We performed a detailed investigation of the dynamics of these processes, using Z scan and pump-probe techniques at the single wavelength of 532 nm. We obtained sigma(12)/sigma(01) approximate to 80 for one of the dyes, which is significantly higher than any previously reported value of which we are aware. The Linear absorption remained significant, a requirement for good optical limiting. However, at high incident energy density for most of the dyes the increasing absorption converted to a bleaching effect with repeated irradiation. This effect was reversed after several seconds in liquid solutions and several minutes in the polymer host, possibly because of replenishment of the dye by diffusion in both media. (C) 1998 Optical Society of America. [References: 29]
机译：我们研究了液态溶液和固体聚（氨基甲酸酯丙烯酸酯）弹性聚合物主体中一系列聚次甲基染料的非线性光学吸收。根据从地面到第一激发态（sigma（01））和从第一到更高激发态（sigma（12））的吸收截面之比以及泵浦波长，它们显示出吸收率会增加或随着入射能量密度的增加而降低。我们的兴趣在于研究用于传感器保护应用的染料的光学极限行为，这要求sigma（12）大于sigma（01）。我们使用Z扫描和泵浦探测技术在532 nm的单个波长上对这些过程的动力学进行了详细的研究。对于一种染料，我们获得的sigma（12）/ sigma（01）大约为80，该值显着高于我们所知的任何先前报告的值。线性吸收仍然很重要，这是良好光学限制的要求。然而，对于大多数染料而言，在高入射能量密度下，随着重复照射，吸收的增加转化为漂白作用。在液体溶液中搅拌几秒钟后，在聚合物基质中搅拌几分钟后，这种作用被逆转，这可能是由于染料在两种介质中的扩散所补充的。 （C）1998年美国眼镜学会。 [参考：29]

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