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Proceedings Paper

Reflective coating for lightweight x-ray optics
Author(s): Kai-Wing Chan; William W. Zhang; David Windt; Mao-Ling Hong; Timo Saha; Ryan McClelland; Marton Sharpe; Vivek H. Dwivedi
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Paper Abstract

X-ray reflective coating for next generation’s lightweight, high resolution optics for astronomy requires thin-film deposition that is precisely fine-tuned so that it will not distort the thin sub-mm substrates. Film of very low stress is required. Films with multi-layer or bi-layer can be deposited to give an effective low stress which cause negligible distortion. Alternatively, mirror distortion can be cancelled by precisely balancing the deformation by coating films on both sides of the substrates. We have been developing techniques to coat glass substrates that can provide good reflectivity in the soft x-ray band below 10 keV, and yet introduce negligible surface distortion for arc-second optics. These efforts include: low-stress deposition by magnetron sputtering and atomic layer deposition of the metals, balancing of gross deformation with two-layer depositions of opposite stresses and with depositions on both sides of the thin mirrors.

Paper Details

Date Published: 17 September 2012
PDF: 11 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84433S (17 September 2012); doi: 10.1117/12.926890
Show Author Affiliations
Kai-Wing Chan, Ctr. for Research and Exploration in Space Science and Technology (United States)
Univ. of Maryland (United States)
William W. Zhang, NASA Goddard Space Flight Ctr. (United States)
David Windt, Reflective X-Ray Optics LLC (United States)
Mao-Ling Hong, Stinger Ghaffarian Technologies, Inc. (United States)
Timo Saha, NASA Goddard Space Flight Ctr. (United States)
Ryan McClelland, Stinger Ghaffarian Technologies, Inc. (United States)
Marton Sharpe, Stinger Ghaffarian Technologies, Inc. (United States)
Vivek H. Dwivedi, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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