The VLT secondary mirror: a report

Roland Geyl; Marc Cayrel

doi:10.1117/12.284708

28 July 1997 The VLT secondary mirror: a report

Roland Geyl, Marc Cayrel

Proceedings Volume 10289, Advanced Materials for Optics and Precision Structures: A Critical Review; 102890L (1997) https://doi.org/10.1117/12.284708
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

Roland Geyl and Marc Cayrel "The VLT secondary mirror: a report", Proc. SPIE 10289, Advanced Materials for Optics and Precision Structures: A Critical Review, 102890L (28 July 1997); https://doi.org/10.1117/12.284708

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