Improving the UV reflectance of the aluminum coating of the 4m SOAR Telescope in the Gemini 8-m sputtering coating facility

Nicole David; Cristian Moreno; Roberto Tighe; Rodrigo Alvarez; Jose Piraces; Claudio Araya; Vicente Vergara; Rossano Rivera; Guillermo Dubo

doi:10.1117/12.2562753

13 December 2020 Improving the UV reflectance of the aluminum coating of the 4m SOAR Telescope in the Gemini 8-m sputtering coating facility

Nicole David, Cristian Moreno, Roberto Tighe, Rodrigo Alvarez, Jose Piraces, Claudio Araya, Vicente Vergara, Rossano Rivera, Guillermo Dubo

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 1144565 (2020) https://doi.org/10.1117/12.2562753
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The SOAR telescope was designed to have a bare Aluminum coating. This coating is performed in the Gemini-South sputtering facility. Two coatings have been done on the SOAR mirror (2004 and 2009). On both occasions, the reflectivity obtained for the UV-blue were lower than the reflectivity of the nominal bare Aluminum. Various tests have been done during 2018 and 2019, in order to reach a higher reflectivity in the UV, including changes in the coating recipe. We report here the progress to date, the performance that we have reached and the problems we have faced in this 8-meter coating facility.

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Nicole David, Cristian Moreno, Roberto Tighe, Rodrigo Alvarez, Jose Piraces, Claudio Araya, Vicente Vergara, Rossano Rivera, and Guillermo Dubo "Improving the UV reflectance of the aluminum coating of the 4m SOAR Telescope in the Gemini 8-m sputtering coating facility", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 1144565 (13 December 2020); https://doi.org/10.1117/12.2562753

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