Stress manipulated coating for figure reshape of light weight X-ray telescope mirrors

Youwei Yao, Xiaoli Wang, Jian Cao, Michael E. Graham, Semyon Vaynman, Shannon E. Grogans, Yifang Cao, Melville P. Ulmer*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII
EditorsGiovanni Pareschi, Stephen L. O'Dell, Giovanni Pareschi, Stephen L. O'Dell
ISBN (Electronic)9781628417692, 9781628417692
StatePublished - 2015
EventOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII - San Diego, United States
Duration: Aug 10 2015Aug 13 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII
Country/TerritoryUnited States
CitySan Diego


  • Figure reshape
  • Stress manipulated coating
  • X-ray mirror
  • X-ray optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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