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

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 electrole...

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Bibliographic Details
Published in:	EPJ Web of Conferences Vol. 215; p. 3002
Main Authors:	Spinelli, Sebastiano, Arcangeli, Luigina, Mazzoleni, Ruben, Rossi, Massimiliano, Terraneo, Marco, Windpassinger, Roman
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Les Ulis EDP Sciences 2019
Subjects:	Aluminum base alloys Optical design Polishing
Online Access:	Get full text
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Summary:	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.
ISSN:	2100-014X 2101-6275 2100-014X
DOI:	10.1051/epjconf/201921503002