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Stable high-reflection Be/Mg multilayer mirrors for solar astronomy at 30.4 nm

Vladimir N. Polkovnikov, Nikolai I. Chkhalo, Roman S. Pleshkov, Nikolai N. Salashchenko, Franz Schäfers, Mewael G. Sertsu, Andrey Sokolov, Mikhail V. Svechnikov, and Sergei Yu. Zuev

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Abstract

The He-II (λ=30.4  nm) emission line is one of the spectral channels chosen to study solar corona. This Letter reports on investigations of novel beryllium (Be)/magnesium multilayer coatings which, when incorporated beneath a protective bilayer of aluminium and Be, ensure particularly high-reflection coefficients of up to 56%, a spectral width of Δλ=1.6  nm (λ/Δλ≈20), and high temporal stability.

© 2019 Optical Society of America

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