Abstract
Various metallic and dielectric thin films are used in silver-based mirrors for astronomical telescopes. The topmost surface of such silver-based mirrors needs to be shielded by a protection coating. Conventionally, the protection coating is deposited at room temperature to minimize thermal stress to which the entire mirror is subjected. Nevertheless, various thin film deposition techniques offer protection coatings with improved characteristics when carried out at elevated temperatures. This paper describes a study of high-performance protected silver-based mirrors annealed at various temperatures in assessing the rationality of introducing post-fabrication annealing with the aim of improving overall optical performance and durability of protected silver-based mirrors.
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