Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apopt..17.3309m&link_type=abstract
Applied Optics, vol. 17, Oct. 15, 1978, p. 3309-3313.
Astronomy and Astrophysics
Astronomy
7
Far Ultraviolet Radiation, Metal Surfaces, Mirrors, Reflecting Telescopes, Ultraviolet Reflection, Aluminum, Gold, Grain Boundaries, Metal Polishing, Metal Vapors, Nickel, Reflectance, Surface Roughness, Ultraviolet Astronomy
Scientific paper
Measured reflection efficiencies are presented for flat samples of diamond-turned aluminum, nickel, and evaporated gold surfaces fabricated by techniques suited for EUV telescopes. The aluminum samples were 6.2-cm-diameter disks of 6061-T6, the electroless nickel samples were formed by plating beryllium disks with 7.5-microns of Kanigen. Gold samples were produced by coating the aluminum and nickel samples with 5 strips of evaporated gold. Reflection efficiencies are given for grazing angles in the 5-75 degree range. The results indicate that for wavelengths over about 100 A, the gold-coated nickel samples yield highest efficiencies. For shorter wavelengths, the nickel samples yield better efficiencies. 500 A is found to be the optimal gold thickness.
Cash Webster
Malina Roger F.
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