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Design of an active metal mirror for large space telescopes
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Paper Abstract

Manufacturing telescopes with 4, 8 or 16 meter apertures is the most effective way to gather the light of faint exoplanets or look back towards the Big Bang. However, ultra-high optical quality large mirrors drastically increase the mass of such instruments - if made conventionally. Thinner, and hence lighter, primary mirrors suffer from gravity release, temperature changes and misalignment during launch. The resulting surface distortions as well as inherent surface errors which arise during manufacturing can be reduced by the implementation of active optics. We designed an active metal mirror as a key element for active optics in space. Our goal was to develop an ultra-stable, set-and-forget, lightweight active mirror with good wavefront correction performance. A simulation routine was developed to investigate the dependency between geometric parameters of the Deformable Mirror (DM) and the residual surface error after correction of Zernike modes. With the final 25 actuator mirror design we can achieve residual errors of less than 10 nm RMS for individual Zernike modes for an optical pupil of 103 mm diameter. It is able to withstand quasi-static launch loads, is insensitive to temperature changes and we can limit the overall weight to 2500 g including actuators and mirror mount.

Paper Details

Date Published: 11 July 2018
PDF: 7 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107037A (11 July 2018); doi: 10.1117/12.2313817
Show Author Affiliations
Matthias Goy, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich Schiller Univ. Jena (Germany)
Claudia Reinlein, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Nicholas Devaney, National Univ. of Ireland, Galway (Ireland)
Fiona Kenny, National Univ. of Ireland, Galway (Ireland)
Ramona Eberhardt, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Andreas Tünnermann, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Friedrich Schiller Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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