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Proceedings Paper

Metallic alternative to glass mirrors (active mirrors in aluminum): a review
Author(s): Jean-Pierre Rozelot; Jean-M. Leblanc
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Paper Abstract

Present-day glass mirrors for telescopes, including the most recent results obtained with aluminum mirrors developed within the European EUREKA procedure (LAMA program) are reviewed. The major advantages of the aluminum-alloy solution, which can be extrapolated today for large size, are discussed. It is shown that aluminum-alloy meniscus blanks, polished on a thin nickel coating, are appropriate to manufacture mirrors of astronomical quality. With the technique of electron-beam welding, large sizes can be envisaged. The development of active optics makes it possible to easily compensate for real-time deformations. The good thermal diffusivity of aluminum alloys leads to a better and faster thermal equilibrium than all other glass structures.

Paper Details

Date Published: 1 September 1991
PDF: 10 pages
Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991); doi: 10.1117/12.46745
Show Author Affiliations
Jean-Pierre Rozelot, GIE TELAS and Observatoire de la Cote d'Azure/CERGA (France)
Jean-M. Leblanc, GIE TELAS (France)

Published in SPIE Proceedings Vol. 1494:
Space Astronomical Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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