Coating stress analysis and compensation for iridium based X-ray mirrors
Résumé
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.
Domaines
Optique / photonique
Fichier principal
Applied Optics - UA - Final - Reviewed - HAL.pdf (741.94 Ko)
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