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Proceedings Paper

Zero CTE polyimides for athermal optical membranes
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Paper Abstract

Polyimides are attractive mirror candidate materials due to their low mass, solar radiation resistance, and cryogenic flexibility. However, polyimides exhibit high coefficients of thermal expansion (CTE) values (40-70 ppm/K), inducing image distortion from CTE mismatch. Additionally, the temperature of large aperture (10 m) membranes is not uniformly controlled in space, further increasing image distortion from anisotropic deformations. The CTE of the MSRS Novastrat polyimide line was adjusted to exhibit CTEs between -16 ppm/K and 53 ppm/K, including 0 ppm/K, 10 ppm/K, 17 ppm/K, and 25 ppm/K corresponding with CTE matches of graphite/epoxy, carbon steel, copper, and aluminum (respectively). The development of these CTE-matched membranes is presented, as well as the effect of the CTE adjustment on the mechanical properties.

Paper Details

Date Published: 11 September 2008
PDF: 9 pages
Proc. SPIE 7061, Novel Optical Systems Design and Optimization XI, 706114 (11 September 2008); doi: 10.1117/12.797893
Show Author Affiliations
Garrett D. Poe, ManTech SRS Technologies, Inc. (United States)
Brian G. Patrick, ManTech SRS Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 7061:
Novel Optical Systems Design and Optimization XI
R. John Koshel; James D. Moore Jr.; David H. Krevor; G. Groot Gregory, Editor(s)

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