High reflectance mirrors for extreme ultraviolet (EUV) space instrumentation.

Details High reflectance mirrors for extreme ultraviolet (EUV) space instrumentation. High reflectance mirrors for extreme ultraviolet (EUV) space instrumentation.

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445..340b&link_type=abstract

Instrumentation in astronomy V, p. 340 - 346

Astronomy and Astrophysics

Astronomy

Extreme Uv:Mirrors, Mirrors:Coatings, Mirrors:Extreme Uv

Scientific paper

Many space astronomy instruments have used near-normal incidence reflecting mirror surfaces of aluminium protected by a thin coating of magnesium fluoride to give high reflectance at ultraviolet wavelengths. This type of coating has excellent performance for wavelengths longward of 1200 Å, but the extreme ultraviolet (EUV) reflectance at λ < 1200 Å is very low because the MgF2 overcoating becomes strongly absorbing in this wavelength region. To obtain a high normal incidence reflectance in the spectral range λ < 1000 Å it will be necessary to use alternative reflecting surfaces without protective overcoatings. Possible mirror coating materials are discussed in this paper and a novel technique is proposed for producing high reflectance EUV mirrors, without absorbing overcoatings, for use in the space environment.

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