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Proceedings Paper

Radiation resistance of single- and multilayer coatings against synchrotron radiation
Author(s): Stefan Guenster; Holger Blaschke; Detlev Ristau; Miltcho Danailov; Mauro Trovo; Alexandre Gatto; Norbert Kaiser; Francesca Sarto; Daniel Flori; F. Menchini
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Paper Abstract

Optical coatings for the use in free electron laser systems have to withstand high power laser radiation and the intense energetic background radiation of the synchrotron radiation source. In general, the bombardment with high energetic photons leads to irreversible changes and a discoloration of the specimen. For the development of appropriate optical coatings, the degradation mechanisms of available optical materials have to be characterized. In this contribution the degradation mechanisms of single layer coatings (fluoride and oxide materials) and multilayer systems will be presented. Fluoride and oxide single layers were produced by thermal evaporation and high energetic ion beam sputter deposition. The same methods were employed for the deposition of multilayer systems. High reflecting coatings for the wavelength region around 180 nm were chosen for the irradiation tests. All samples were characterized after production by spectrophotometry covering the VUV , VIS, and MIR spectral range. Mechanical coating stress was evaluated with interferometric methods. Synchrotron irradiation tests were performed at ELETTRA, using a standardized irradiation cycle for all tests. Ambient pressure and possible contamination in the vacuum environment were monitored by mass spectrometry. For comparison, the optical coatings were investigated again in the VUV, VIS, and MIR spectral range after irradiation. On selected samples XRD measurements were performed. The observed degradation mechanisms comprise severe damages like coating and substrate surface ablation. Color centre formation in the VIS spectral range and an increase of VUV absorption were found as a major origin for a severe degradation of VUV transmittance On the basis of the performed investigations, a selection of coating materials and coating systems is possible in respect to the damage effects caused by synchrotron radiation.

Paper Details

Date Published: 25 February 2004
PDF: 12 pages
Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); doi: 10.1117/12.514801
Show Author Affiliations
Stefan Guenster, Laser Zentrum Hannover e.V. (Germany)
Holger Blaschke, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)
Miltcho Danailov, Sincrotrone Trieste (Italy)
Mauro Trovo, Sincrotrone Trieste (Italy)
Alexandre Gatto, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Norbert Kaiser, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Francesca Sarto, ENEA (Italy)
Daniel Flori, ENEA (Italy)
F. Menchini, ENEA (Italy)

Published in SPIE Proceedings Vol. 5250:
Advances in Optical Thin Films
Claude Amra; Norbert Kaiser; H. Angus Macleod, Editor(s)

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