Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3445...86l&link_type=abstract
Proc. SPIE Vol. 3445, p. 86-95, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX, Oswald H. Siegmund; Mark A. Gummin;
Astronomy and Astrophysics
Astronomy
Scientific paper
Multilayer coatings with a small number of layers were designed to give an increase in normal incidence reflectance in the extreme UV over that of the available single layer coatings. Multilayer coatings based on Al, MgF(subscript 2) and SiC or B(subscript 4)C showed higher reflectance than single layers of SiC and B(subscript 4)C in the spectral region from 57.9 nm to 121.6 nm H Lyman (alpha) line and above. The major increase in reflectance was obtained at wavelengths close to 121.6 nm. Reflectance degraded slightly over time in the same way as single way as single layer coatings. Preliminary result have recently been obtained wit a second design based on a superposition of films of increasing refractive index form outermost to innermost layer, e.g. with multilayer coatings of SiC on B(subscript 4)C on diamond-like carbon. A combination of both designs, with multilayer coatings of the type Al/MgF(subscript 2)/DLC/B(subscript 4)C/SiC, results in further increase in the EUV reflectance, although their stability has not been determined yet.
Keski-Kuha Ritva A.
Larruquert Juan Ignacio
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