Gemini's protected silver coatings: first two years in operation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Gemini twins were the first large modern telescopes to receive protected Silver coatings on their mirrors in 2004. We report the performance evolution of these 4-layer coatings in terms of reflectivity and emissivity. We evaluate the durability of these thin films by comparison to the evolution of some samples that we have produced and exposed since 2002. Finally, we will explain our maintenance plan.

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