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Proceedings Paper

The Gemini Observatory protected silver coating: ten years in operation
Author(s): T. Schneider; T. Vucina; C. Ah Hee; C. Araya; C. Moreno
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Paper Abstract

Since 2004 the Gemini telescopes have used a protected 4-layer silver coating on their 8-meter diameter primary mirror and other smaller optics. Protected silver was chosen for the twin telescopes due to its high reflectivity and low emissivity properties. For over 10 years the protected 4-layer silver coating at Gemini exceeded the science requirements for reflectivity of 88% between 0.4-0.7 μm and 84% between 0.7-1.1 μm. Initial durability requirements that the coating should last at least two years have been also been surpassed. All mirrors have met the durability requirement, with most outlasting it significantly. Provided is a ten year retrospective on the progress in the use and maintenance of 4-layer silver coatings on large astronomical optics.

Paper Details

Date Published: 27 July 2016
PDF: 10 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990632 (27 July 2016); doi: 10.1117/12.2233756
Show Author Affiliations
T. Schneider, Gemini Observatory (United States)
T. Vucina, Gemini Observatory (Chile)
C. Ah Hee, Gemini Observatory (United States)
C. Araya, Gemini Observatory (Chile)
C. Moreno, Gemini Observatory (Chile)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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