Abstract
This study considers the reflective characteristics of three-component Si/Al/Sc multilayer mirrors with a ${\rm MoSi}_2$ protective cap layer as candidates for telescopes for observation of the solar corona in the He I ($\lambda = 58.4\;{\rm nm}$) spectral line. At 58.4 nm, a peak reflectance of 32% and a spectral width at a half-maximum intensity of $\Delta \lambda = 5.4\;{\rm nm}$ are obtained. The temporal stability of the reflectance at $\lambda = 58.4\;{\rm nm}$ for Si/Al/Sc samples with a 6 nm thick ${\rm MoSi}_2$ cap layer is investigated during storage in air for 20 months.
© 2020 Optical Society of America
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