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Proceedings Paper

Update on UCO's advanced coating lab development of silver-based mirror coatings
Author(s): Andrew C. Phillips; David M. Fryauf; Nobuhiko P. Kobayashi; Brian DuPraw; Spencer Cheleden; Christopher Ratliff; Michael J. Bolte; David Cowley
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Paper Abstract

We present progress in efforts underway at the University of California Observatories to develop high performance durable silver-based mirror coatings for telescope and instruments. Silver-based coatings are extremely prone to tarnish and/or corrosion, and successful coatings depend not only on the materials used but also the deposition processes employed. Our physical vapor deposition (PVD) chamber allows both sputtering and ion-assisted e-beam depositions for head-to-head comparison of deposition processes, and we present results of these comparisons. In this paper, we review the problem and discuss our recent activities and findings. We discuss a systematic study to determine which oxides, nitrides and fluorides provide the best protection in environmental tests. We present initial results into the effects of stress in our specific thin films, and thee effects of stress on mirror coating durability. We also discuss studies using Atomic Layer Deposition (ALD) over-coating of Ag, and we describe a large ALD research chamber currently under construction that will demonstrate ALD processes on larger substrates (70 cm diameter).

Paper Details

Date Published: 1 August 2016
PDF: 10 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99122G (1 August 2016); doi: 10.1117/12.2233009
Show Author Affiliations
Andrew C. Phillips, Univ. of California Observatories (United States)
David M. Fryauf, Univ. of California, Santa Cruz (United States)
NASA Ames Research Ctr. (United States)
Nobuhiko P. Kobayashi, Univ. of California, Santa Cruz (United States)
NASA Ames Research Ctr. (United States)
Brian DuPraw, Univ. of California Observatories (United States)
Spencer Cheleden, Pacific Collegiate School (United States)
Christopher Ratliff, Univ. of California Observatories (United States)
Michael J. Bolte, Univ. of California Observatories (United States)
David Cowley, Univ. of California Observatories (United States)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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