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Proceedings Paper

Use of beryllium for the VLT secondary mirror
Author(s): Marc Cayrel; Roger A. Paquin; Thomas B. Parsonage; Stefano Stanghellini; Karl H. Dost
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Paper Abstract

REOSC has been selected for the design, manufacturing and integration of the four ESO very large telescope (VLT) secondary mirrors. The VLT secondary mirrors are 1.12 m lightweight convex hyperbolic mirrors made of beryllium. Despite the VLT active optics correction capabilities, the use of a metal for the mirror structure implies specific manufacturing processes and associated design rules in order to ensure its dimensional stability during the telescope required life time. This paper describes how the fabrication process of the VLT secondary mirror has been optimized in order to maximize the dimensional stability of its structure. The beryllium properties are analyzed in parallel with the mirror requirements, the choices for the manufacturing, at all levels, are presented. A short work progress is presented, with the achieved mirror properties.

Paper Details

Date Published: 11 November 1996
PDF: 13 pages
Proc. SPIE 2857, Advanced Materials for Optical and Precision Structures, (11 November 1996); doi: 10.1117/12.258294
Show Author Affiliations
Marc Cayrel, REOSC (France)
Roger A. Paquin, Advanced Materials Consultant (United States)
Thomas B. Parsonage, Brush Wellman Inc. (United States)
Stefano Stanghellini, European Southern Observatory (Germany)
Karl H. Dost, Dornier GmbH (Germany)

Published in SPIE Proceedings Vol. 2857:
Advanced Materials for Optical and Precision Structures
Mark A. Ealey, Editor(s)

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