In the γ -ray Cherenkov Astronomy framework mirror coating plays a crucial role in defining the light response of the telescope.We carried out a study for new mirror coating solutions with both a numerical simulation software and a vacuum chamber for small sample production. In this article, we present a new mirror coating solution consisting of a 28-layer interferometric SiO_2-TiO_2-HfO_2 design deposited on a glass substrate, whose average reflectance is above 90 for normally incident light in the wavelength range between 300 and 550 nm.
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