Stable Multilayer Reflective Coatings for λ(HeI) = 58.4 nm for the KORTES Solar Telescope

V. N. Polkovnikov; N. I. Chkhalo; E. Meltchakov; F. Delmotte; S. Yu. Zuev; N. N. Salashchenko; M. V. Svechnikov; N. N. Tsybin

doi:10.1134/S1063785019020147

Stable Multilayer Reflective Coatings for λ(HeI) = 58.4 nm for the KORTES Solar Telescope

Authors: Polkovnikov V.N.¹, Chkhalo N.I.¹, Meltchakov E.², Delmotte F.², Zuev S.Y.¹, Salashchenko N.N.¹, Svechnikov M.V.¹, Tsybin N.N.¹
Affiliations:
1. Institute for Physics of Microstructures, Russian Academy of Sciences
2. Laboratoire Charles Fabry, Institut d’Optique Graduate School, CNRS, Université Paris-Saclay
Issue: Vol 45, No 2 (2019)
Pages: 85-88
Section: Article
URL: https://bakhtiniada.ru/1063-7850/article/view/208200
DOI: https://doi.org/10.1134/S1063785019020147
ID: 208200

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Abstract

Multilayer aluminum-based structures reflecting at λ(HeI) = 58.4 nm were studied. Spectral and angular dependences of the reflection coefficient of these coatings were determined using a laboratory reflectometer and at the ELETTRA and BESSY II synchrotrons. The optical characteristics of multilayer Ru/Al and Mo/Al mirrors with a protective MoSi₂ layer were found to be stable: the absolute change in the reflection coefficient within 18 months of storage in air was no larger than 1.5%. The peak near-normal reflection coefficient for Mo/Al mirrors at 58.4 nm was R = 26.1% with FWHM Δλ_0.5 = 10 nm of the reflection curve.

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Stable Multilayer Reflective Coatings for λ(HeI) = 58.4 nm for the KORTES Solar Telescope

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Abstract

About the authors

Supplementary files