NOPT – New polishing techniques for scalable, light-weighted mirrors of different materials

Sebastiano Spinelli, Luigina Arcangeli, Ruben Mazzoleni, Massimiliano Rossi, Marco Terraneo, Roman Windpassinger, A. Vasdekis, O. Fähnle
2019 EPJ Web of Conferences  
In the framework of an assessment of optical polishing techniques, ESA has signed a contract with Media Lario to deliver two 250 mm mirrors with a common optical design to be polished down to very tight surface requirements. NOPT mirrors are respectively made of Zerodur and AlSi alloy with electroless nickel and will they be polished by means of bonnet polishing. Mirrors are light-weighted up to 20kg/m2; the mechanical and optical design is proven to be scalable up to 1m CA surfaces. This paper
more » ... urfaces. This paper reviews the mirrors opto-mechanical design, introduce the polishing and metrology strategy while highlighting the differences and the common point in fabricating such mirror in Zerodur and metal.
doi:10.1051/epjconf/201921503002 fatcat:yxexrgzumnamjky7jodahz3qru