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. 2018 Oct 10;57(29):8775-8779.
doi: 10.1364/AO.57.008775.

Coating stress analysis and compensation for iridium-based x-ray mirrors

Anne-Catherine Probst, Thomas Begou, Thorsten Döhring, Sebastian Zeising, Manfred Stollenwerk, Johannes Stadtmüller, Florian Emmerich, Julien Lumeau

Coating stress analysis and compensation for iridium-based x-ray mirrors

Anne-Catherine Probst et al. Appl Opt. .

Abstract

Iridium-based coatings for mirrors of x-ray telescopes are studied. In particular, stress-induced deformation is characterized and shown to be compressive and equal to -1786 MPa. Two methods for stress compensation are then studied. One relies on the deposition of silica on the back surface of the substrate and a second one relies on the deposition of a chromium sublayer. Advantages and drawbacks of each of these techniques are presented.

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