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Proceedings Paper

Measurement of optical constants n and k of lexan and polyimide
Author(s): Antonella Cavadi; Maria Antonella Artale; Marco Barbera; Alfonso Collura; Forbes R. Powell; Salvatore Varisco
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Paper Abstract

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.

Paper Details

Date Published: 22 October 1999
PDF: 11 pages
Proc. SPIE 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, (22 October 1999); doi: 10.1117/12.366568
Show Author Affiliations
Antonella Cavadi, Instituto e Osservatorio Astronomico G.S. Vaiana (Italy)
Maria Antonella Artale, Univ. degli Studi di Palermo (Italy)
Marco Barbera, Instituto e Osservatorio Astronomico G.S. Vaiana (Italy)
Alfonso Collura, Instituto e Osservatorio Astronomico G.S. Vaiana (Italy)
Forbes R. Powell, Luxel Corp. (United States)
Salvatore Varisco, Instituto e Osservatorio Astronomico G.S. Vaiana (Italy)


Published in SPIE Proceedings Vol. 3765:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X
Oswald H. W. Siegmund; Kathryn A. Flanagan, Editor(s)

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