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18 December 2012 Lightweight stable sandwich mirrors: current achievements in the development
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RUAG Space, together with THALES SESO, initiated the development of light weighted sandwich structures for optical applications, already some years ago. The results of the use of this type of structure applied for optical benches and the first outlook for their use as mirror substrates were published in previous papers. This paper is going to present the results of the polishing activities performed on a 650 mm diameter mirror manufactured with Zerodur face sheets and a low density aluminum core. This substrate showed a mass density of 15 kg/m2. The excellent optical quality achieved proves the suitability of this technology for several applications, in particular for scanning mirrors for space and possibly for moveable mirror in ground based astronomical telescopes. With the emerging need for extremely high flatness under thermal loads (radius of curvature < 400km) activities have been initiated to identify materials for the core of the substrate closer matching the extremely low CTE offered by materials like Zerodur. The progresses made in this field are presented and an outlook for future activities is provided.
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G. Harbach, A. Herren, Th. Hausner, E. Rugi Grond, and J. J. Fermé "Lightweight stable sandwich mirrors: current achievements in the development", Proc. SPIE 8550, Optical Systems Design 2012, 855015 (18 December 2012);

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