Physics – Optics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994an....315..323s&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 315, no. 4, p. 323-328
Physics
Optics
Aluminum, Mirrors, Optical Materials, Optical Reflection, Reflecting Telescopes, Cassegrain Optics, Protective Coatings, Reflectance, Schwarzschild Antennas
Scientific paper
For 60 years the common method generally used to coat astronomical mirrors is vacuum deposition of pure aluminium by evaporation. Such mirror surfaces degrade very fast resulting in a considerably reduced optical throughput. Protecting layers (oxides like SiO2, fluorides like CaF2) are not applied because their removal, necessary before realuminization, involves damage to the optical surface of the mirror substrate which would necessitate a costly refiguring of that surface. The reduction of the throughput exceeds typically 30 % for a Cassegrain system; it precludes the introduction of excellent optical design solutions in astronomy based on Schwarzschild's theory using four-reflection optics. In addition, the cost of the conventional procedure of aluminizing and its risks increase tremendously with the size of the mirrors of the very large telescopes now planned or under construction. I propose a three-layer composion in two forms.
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