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Proceedings Paper

Optical design of a Coudé-Train for a stable and efficient simultaneous feeding of the ESPRESSO spectrograph from the four VLT telescopes
Author(s): Alexandre Cabral; João Coelho; Manuel Abreu; Manuel Monteiro; Ricardo Gomes; Pedro Santos; António Oliveira; Gerardo Ávila; Bernard-Alexis Delabre; Denis Mégevand; Filippo Zerbi; Paolo Di Marcantonio; Christophe Lovis; Nuno C. Santos
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Paper Abstract

ESPRESSO is a fibre-fed, cross-dispersed, high-resolution, echelle spectrograph. Being the first purpose of ESPRESSO to develop a competitive and innovative high-resolution spectrograph to fully exploit the VLT (Very Large Telescope), and allow new science, it is important to develop the VLT array concept bearing in mind the need to obtain the highest stability, while preserving its best efficiency. This high-resolution ultra-stable spectrograph will be installed in the VLT at the Combined Coudé Laboratory (CCL), fed by four Coudé Trains, which brings the light from the Nasmyth platforms of the four VLT Unit Telescopes to the CCL. ESPRESSO will combine the efficiency of modern echelle spectrograph with extreme radial-velocity precision. It will achieve a gain of two magnitudes with respect to its predecessor HARPS, and the instrumental radial-velocity precision will be improved to reach cm/s level. Thanks to its ability of combining incoherently the light of the 4 UTs, ESPRESSO will offer new possibilities in various fields of astronomy. The Coudé Train is composed of a set of prisms and lenses to deliver a pupil and an image in the CCL, including an Atmospheric Dispersion Compensator. In this paper, we present the optical design of the Coudé Trains, the opto-mechanical concept, the required control, the main characteristics and expected performances.

Paper Details

Date Published: 18 November 2013
PDF: 10 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87850L (18 November 2013); doi: 10.1117/12.2026179
Show Author Affiliations
Alexandre Cabral, Univ. de Lisboa (Portugal)
João Coelho, Univ. de Lisboa (Portugal)
Manuel Abreu, Univ. de Lisboa (Portugal)
Manuel Monteiro, Univ. do Porto (Portugal)
Ricardo Gomes, Univ. de Lisboa (Portugal)
Pedro Santos, Univ. de Lisboa (Portugal)
António Oliveira, Univ. de Lisboa (Portugal)
Gerardo Ávila, European Southern Observatory (Germany)
Bernard-Alexis Delabre, European Southern Observatory (Germany)
Denis Mégevand, Observatoire de l’Univ. de Genève (Switzerland)
Filippo Zerbi, INAF - Osservatorio Astronomico di Brera (Italy)
Paolo Di Marcantonio, INAF - Osservatorio Astronomico di Trieste (Italy)
Christophe Lovis, Observatoire de l’Univ. de Genève (Switzerland)
Nuno C. Santos, Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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