Coating the 8-m Gemini telescopes with protected silver

Maxime Boccas, Tomislav Vucina, Claudio Araya, Esteban Vera, Clayton Ahhee

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59 Citas (Scopus)

Resumen

The Gemini telescopes were designed to be infrared-optimized. Among the features specified for optimal performance is the use of silver-based coatings on the mirrors. The feasibility study contracted by Gemini in 1994-1995 provided both techniques and recipes to apply these high-reflectivity and low-emissivity films. All this effort is now being implemented in our coating plants. At the time of the study, sputtering experiments showed that a reflectivity of 99.1% at 10μm was achievable. We have now produced bare and protected silver sputtered films in our coating plants and conducted environmental testing, both accelerated and in real-life conditions, to assess the durability. We have also already applied, for the first time ever, protected-silver coatings on the main optical elements (M1, M2 and M3) of an 8-m telescope. We report here the progress to date, the performance of the films, and our long-term plans for mirror coatings and maintenance.

Idioma originalInglés
Páginas (desde-hasta)239-253
Número de páginas15
PublicaciónProceedings of SPIE - The International Society for Optical Engineering
Volumen5494
DOI
EstadoPublicada - 2004
Publicado de forma externa
EventoOptical Fabrication, Metrology, and Materials Advancements for Telescopes - Glasgow, Reino Unido
Duración: 24 jun. 200425 jun. 2004

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