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13 December 2020 Recent results of UCO’s silver-based mirror coating development
Andrew C. Phillips, Brian DuPraw, David M. Fryauf, Michael J. Bolte, Nobuhiko P. Kobayashi
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Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114511N (2020) https://doi.org/10.1117/12.2562841
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
Abstract
University of California Observatories has undertaken an effort to develop improved optical coatings for astronomy, with a particular emphasis on long-lived, highly efficient silver-based mirror coatings. We previously reported on a thin-film design including nickel oxide that showed significant improvement in accelerated aging tests, but had not yet undergone field testing. In this paper we briefly summarize our past work, and then discuss (a) two years’ field testing of our design with NiO; (b) efforts to find other materials that play the same role as NiO in improving durability; and (c) tests with ScF3 that show good results as a replacement for YF3/YbF3 but with improved optical properties. We also report on a long-term study of the effects of multiple cycles of stripping/re-coatings on various substrates, finding no significant substrate damage with aluminum, but some damage over time with our current protected-Ag coatings, particularly on borosilicate glass.
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Andrew C. Phillips, Brian DuPraw, David M. Fryauf, Michael J. Bolte, and Nobuhiko P. Kobayashi "Recent results of UCO’s silver-based mirror coating development", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114511N (13 December 2020); https://doi.org/10.1117/12.2562841
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KEYWORDS
Coating
Mirrors
Astronomy
Nickel
Observatories
Optical coatings
Reflectivity
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