11 November 1996 Use of beryllium for the VLT secondary mirror
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marc Cayrel, Roger A. Paquin, Thomas B. Parsonage, Stefano Stanghellini, Karl H. Dost, "Use of beryllium for the VLT secondary mirror", Proc. SPIE 2857, Advanced Materials for Optical and Precision Structures, (11 November 1996); doi: 10.1117/12.258294; https://doi.org/10.1117/12.258294


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