Measurement of optical constants n and k of lexan and polyimide
Measurement of optical constants n and k of lexan and polyimide
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lexan 和聚酰亚胺的光学常数 n 和 k 的测量
DOI：
10.1117/12.366568
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Varisco
中科院分区：
文献类型：
--
作者：
Antonella Cavadi;M. Artale;M. Barbera;A. Collura;F. Powell;S. Varisco
我们目前的初步结果，旨在表征软X射线探测器的过滤器的潜在用途的材料的光学特性的程序。特别是，我们讨论了一种方法，我们已经用来推导和模型的折射率n和消光系数k的薄塑料薄膜材料。该方法基于描述k的量子力学模型的参数的最佳拟合估计。然后使用Kramers-Kronig关系来评估n的值。这种方法提供了精确的值，以前未知的聚酰亚胺和聚碳酸酯的光学常数，允许模型的多层过滤器，如铝化聚酰亚胺过滤器的HRC板钱德拉X射线天文台的传输。
We present preliminary results on a program aimed at characterizing the optical properties of materials of potential usage in filters for soft x-ray detectors. In particular, we discuss a method that we have used to derive and model the refractive index n and the extinction coefficient k of thin plastic film materials. The method is based on best fit estimates of the parameters of a quanto- mechanical model describing k. The value of n is then evaluated using the Kramers-Kronig relationship. This method has provided accurate values of previously unknown optical constants of polyimide and lexan allowing to model the transmission of multilayer filters such as the aluminized polyimide filters of the HRC on board Chandra X-ray Observatory.