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Proceedings Paper

Stress manipulated coating for figure reshape of light weight X-ray telescope mirrors
Author(s): Youwei Yao; Xiaoli Wang; Jian Cao; Michael E. Graham; Semyon Vaynman; Shannon E. Grogans; Yifang Cao; Melville P. Ulmer
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Paper Abstract

We present our idea to correct the surface profile of X-ray telescope mirrors by employing a spatially distributed variable stress coating. Future X-ray telescope missions require light weight optics with an angular resolution ≤. 1" . However, the typical desired thickness of a light weight mirror shell is ≤ 0.4mm, and to date such thin shelled mirrors that have been fabricated cannot meet the required figure accuracy. Therefore most the common approach is to modify the figure of the initially produced mirror shell. In this paper, we describe one such approach. Our approach uses a DC magnetron sputtering process with a variable electrical bias. The end result is a locally variable stress which has the potential to improve the figure of the initially fabricated thin . In this work we report out first results. These include: reproducibility, important technical details of the coating process, and the results of stability tests on several samples monitored. Further, as a proof of concept, we applied a coating with a modulated bias to demonstrate the feasibility to manipulate the surface profile.

Paper Details

Date Published: 4 September 2015
PDF: 7 pages
Proc. SPIE 9603, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII, 96031J (4 September 2015); doi: 10.1117/12.2186146
Show Author Affiliations
Youwei Yao, Northwestern Univ. (United States)
Xiaoli Wang, Northwestern Univ. (United States)
Jian Cao, Northwestern Univ. (United States)
Michael E. Graham, Northwestern Univ. (United States)
Semyon Vaynman, Northwestern Univ. (United States)
Shannon E. Grogans, Northwestern Univ. (United States)
Yifang Cao, Northwestern Univ. (United States)
Melville P. Ulmer, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 9603:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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