Opt Lett. 2019 Jan 15;44(2):263-266. doi: 10.1364/OL.44.000263.
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.
氦-Ⅱ（λ=30.4nm）发射线是用于研究日冕的光谱通道之一。本信函报告了新型铍（Be）/镁多层涂层的研究情况，当将其置于铝和 Be 的保护双层之下时，这些涂层可确保特别高的反射系数，最高可达 56%，光谱宽度为 Δλ=1.6nm（λ/Δλ≈20），并且具有高的时间稳定性。
