22 October 1999 Measurement of optical constants n and k of lexan and polyimide
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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.
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Antonella Cavadi, Antonella Cavadi, Maria Antonella Artale, Maria Antonella Artale, Marco Barbera, Marco Barbera, Alfonso Collura, Alfonso Collura, Forbes R. Powell, Forbes R. Powell, Salvatore Varisco, Salvatore Varisco, } "Measurement of optical constants n and k of lexan and polyimide", Proc. SPIE 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, (22 October 1999); doi: 10.1117/12.366568; https://doi.org/10.1117/12.366568

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