https://doi.org/10.1051/epjconf/201921503002
NOPT – New polishing techniques for scalable, light-weighted mirrors of different materials
1
Media Lario Technologies, 23842 Bosisio Parini, Italy
2
ESA, 23842 Bosisio Parini, Italy
* Corresponding author: massimiliano.rossi@medialario.com
Published online: 10 September 2019
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 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.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
