Reflective coating for lightweight x-ray optics

Kai-Wing Chan; William W. Zhang; David Windt; Mao-Ling Hong; Timo Saha; Ryan McClelland; Marton Sharpe; Vivek H. Dwivedi

doi:10.1117/12.926890

17 September 2012 Reflective coating for lightweight x-ray optics

Kai-Wing Chan, William W. Zhang, David Windt, Mao-Ling Hong, Timo Saha, Ryan McClelland, Marton Sharpe, Vivek H. Dwivedi

Author Affiliations +

Proceedings Volume 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray; 84433S (2012) https://doi.org/10.1117/12.926890
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Kai-Wing Chan, William W. Zhang, David Windt, Mao-Ling Hong, Timo Saha, Ryan McClelland, Marton Sharpe, and Vivek H. Dwivedi "Reflective coating for lightweight x-ray optics", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84433S (17 September 2012); https://doi.org/10.1117/12.926890

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