A new solution for mirror coating in $\gamma$-ray Cherenkov Astronomy
  In the $\gamma$-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. 
Antonio Bonardi, Gerd P\"uhlhofer, Stephan Hermanutz, Andrea   Santangelo
astro-ph.IM