Optical characterization of thermal lens effect in ethanol and the influence of focusing lens and liquid cell size
Optical characterization of thermal lens effect in ethanol and the influence of focusing lens and liquid cell size
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DOI：
10.1016/j.optlastec.2011.05.023
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发表时间：
2012-02-01
影响因子：
5
通讯作者：
Jafarabadi, M. Akbari
中科院分区：
文献类型：
--
作者：
Mandieh, M. H.;Jafarabadi, M. Akbari
高功率连续激光束在吸收介质中传播时，由于热自诱导折射率梯度，会发生扩散、扭曲或偏转。本文通过实验研究了液态乙醇中热透镜效应的光学特性。热透镜是由高功率氦 - 氖激光束聚焦在乙醇（吸收液体）中产生的。采用Z - 扫描方法研究了热透镜效应。根据光束在液体池中聚焦位置的不同，结果显示在相对于液体池固定在特定位置的屏幕上，光强既有增加也有减少。结果表明，这些效应取决于透镜焦距、液体池尺寸以及透镜的聚焦位置。根据实验结果，如果改变样品池内聚焦区域的位置，透射光束的聚焦和散焦之间存在竞争。利用一种简单的光学描述对实验结果进行了解释。（C）2011爱思唯尔有限公司。保留所有权利。
A high power cw laser beam propagating in an absorbing medium spreads, distorted or deflected as a result of thermally self-induced refractive index gradients. In this paper, optical characteristic of thermal lens effect in liquid ethanol was studied experimentally. The thermal lens was induced by focusing of a high power He-Ne laser beam in ethanol (absorbing liquid). The thermal lens effect was investigated by Z-scan method. Depending on the focusing position of the beam in liquid cell, the results show both intensity increasing and decreasing on a screen, which is fixed at a specific position with respect to the cell. The results show such effects depend on the lens focal length, the liquid cell size, and the focusing position of the lens. According to the results there is a competition between focusing and defocusing of the transmitted beam if the position of the focusing region inside the sample cell is changed. Using a simple optical description, the experimental results were interpreted. (C) 2011 Elsevier Ltd. All rights reserved.