Broadband EUV/FUV mirror coatings for a solar spectrograph mission

Luca Teriaca; Torsten Feigl; Udo Schühle

doi:10.1117/12.2313784

6 July 2018 Broadband EUV/FUV mirror coatings for a solar spectrograph mission

Luca Teriaca, Torsten Feigl, Udo Schühle

Proceedings Volume 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray; 106992Y (2018) https://doi.org/10.1117/12.2313784
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

As it is rich in spectral lines emitted by plasma between 10000 K and 20 MK, the vacuum ultraviolet (VUV - 17 to 200 nm) solar spectrum is extremely valuable for instruments that study the physics of the solar atmosphere. We present multilayer coatings with simultaneous broadband reflectance in the two spectral ranges of 16.9 nm to 21.5 nm and 46.3 nm to 127.5 nm. The coatings are based on Mo/Si multilayers with a thin capping layer of boron carbide (B₄C). Samples were produced and their reflectance measured. Their performance in terms of resistance to high temperatures and low micro-roughness was also assessed by measurement. Our study shows that a coating with the characteristics required by next generation spectrometers for studies of the solar atmosphere is feasible.

Citation Download Citation

Luca Teriaca, Torsten Feigl, and Udo Schühle "Broadband EUV/FUV mirror coatings for a solar spectrograph mission", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106992Y (6 July 2018); https://doi.org/10.1117/12.2313784

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