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Proceedings Paper

Optical design of the ESPRESSO spectrograph at VLT
Author(s): P. Spanò; D. Mégevand; J. M. Herreros; F. M. Zerbi; A. Cabral; P. Di Marcantonio; C. Lovis; S. Cristiani; R. Rebolo; N. Santos; F. Pepe
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Paper Abstract

ESPRESSO, a very high-resolution, high-efficiency, ultra-high stability, fiber-fed, cross-dispersed echelle spectrograph located in the Combined-Coudé focus of the VLT, has been designed to detect exo-planets with unprecedented radial velocity accuracies of 10 cm/sec over 20 years period. To increase spectral resolution, an innovative pupil slicing technique has been adopted, based onto free-form optics. Anamorphism has been added to increase resolution while keeping the physical size of the echelle grating within reasonable limits. Anamorphic VPH grisms will help to decrease detector size, while maximizing efficiency and inter-order separation. Here we present a summary of the optical design of the spectrograph and of expected performances.

Paper Details

Date Published: 15 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77350K (15 July 2010); doi: 10.1117/12.858096
Show Author Affiliations
P. Spanò, INAF, Osservatorio Astronomico di Brera (Italy)
D. Mégevand, Observatoire de Genève, Univ. de Genève (Switzerland)
J. M. Herreros, Instituto de Astrofísica de Canarias (Spain)
F. M. Zerbi, INAF, Osservatorio Astronomico di Brera (Italy)
A. Cabral, Univ. de Lisboa (Portugal)
P. Di Marcantonio, INAF, Osservatorio Astronomico di Trieste (Italy)
C. Lovis, Observatoire de Genève, Univ. de Genève (Switzerland)
S. Cristiani, INAF, Osservatorio Astronomico di Trieste (Italy)
R. Rebolo, Instituto de Astrofísica de Canarias (Spain)
N. Santos, Univ. do Porto (Portugal)
F. Pepe, Observatoire de Genève, Univ. de Genève (Switzerland)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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