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Proceedings Paper

Development of multilayer coatings for solar orbiter EUV imaging telescopes
Author(s): Franck Delmotte; Evgueni Meltchakov; Sébastien de Rossi; Françoise Bridou; Arnaud Jérome; François Varnière; Raymond Mercier; Frédéric Auchère; Xueyan Zhang; Bruno Borgo; Cydalise Dumesnil; Serge François; Marc Roulliay; Udo Strauch
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Paper Abstract

Since more than 20 years, Laboratoire Charles Fabry and Institut d’Astrophysique Spatiale are involved in development of the EUV multilayer coating for solar imaging. Previous instruments, such as the SOHO EIT and STEREO EUVI telescopes, employed the Mo/Si multilayer coatings, which offered at that time the best efficiency and stability. We present here recent results of the development of highly efficient EUV multilayers coatings at 17.4 nm and 30.4 nm for the Solar Orbiter mission. New multilayer structures, based on a combination of three materials including aluminum, have been optimized both theoretically and experimentally. We have succeeded to reduce interfacial roughness of Albased multilayers down to 0.5 nm via optimization of the multilayer design and the deposition process. The EUV peak reflectance of Al/Mo/SiC and Al/Mo/B4C multilayer coatings reaches 56% at 17.4 nm, the highest value reported up to now for this wavelength. We have also optimized specific bi-periodic structures that possess two reflection bands in the EUV range with high spectral selectivity. The EUV reflectivity of these Al-based dual-band coatings are compared with the Si/Mo/B4C baseline coating for Solar Orbiter. Since the stability of reflecting multilayer coating is an important issue for space missions, we have also studied the temporal stability as well as the resistivity of the coatings to thermal cycling and to proton irradiation. Experimental results confirm that Al/Mo/SiC and Al/Mo/B4C multilayer coatings are good candidates for the Solar Orbiter EUV imaging telescopes.

Paper Details

Date Published: 26 September 2013
PDF: 10 pages
Proc. SPIE 8862, Solar Physics and Space Weather Instrumentation V, 88620A (26 September 2013); doi: 10.1117/12.2036050
Show Author Affiliations
Franck Delmotte, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Evgueni Meltchakov, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Sébastien de Rossi, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Françoise Bridou, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Arnaud Jérome, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
François Varnière, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Raymond Mercier, Lab. Charles Fabry, Institut d'Optique, CNRS, Univ. Paris Sud (France)
Frédéric Auchère, Institut d'Astrophysique Spatiale (France)
Xueyan Zhang, Institut d'Astrophysique Spatiale (France)
Bruno Borgo, Institut d'Astrophysique Spatiale (France)
Cydalise Dumesnil, Institut d'Astrophysique Spatiale (France)
Serge François, Institut d'Astrophysique Spatiale (France)
Marc Roulliay, Institut des Sciences Moléculaires d'Orsay (France)
Udo Strauch, Helmholtz-Zentrum Dresden-Rossendorf (Germany)


Published in SPIE Proceedings Vol. 8862:
Solar Physics and Space Weather Instrumentation V
Silvano Fineschi; Judy Fennelly, Editor(s)

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