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Proceedings Paper

The VLT secondary mirror: a report
Author(s): Roland Geyl; Marc Cayrel
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Paper Abstract

This paper relates the development undertaken to produce the first unit of the European ESO VLT Secondary Mirror in Beryllium. The specification will be presented with the historical evolution of the mirror substrate material choice. Beryllium material quality will be discussed regarding the long term stability and mirror design will be presented. An optical test set-up has been specifically designed and fabricated for the mirror performance verification. Blank fabrication and polishing is reported with the key step of external edge lip cutting to achieve coincidence between mechanical diameter and clear aperture as required for I.R astronomical observations. Mirror long term stability is assessed from data gained during fabrication.

Paper Details

Date Published: 28 July 1997
PDF: 12 pages
Proc. SPIE 10289, Advanced Materials for Optics and Precision Structures: A Critical Review, 102890L (28 July 1997); doi: 10.1117/12.284708
Show Author Affiliations
Roland Geyl, REOSC (France)
Marc Cayrel, REOSC (France)

Published in SPIE Proceedings Vol. 10289:
Advanced Materials for Optics and Precision Structures: A Critical Review
Mark A. Ealey; Roger A. Paquin; Thomas B. Parsonage, Editor(s)

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