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Proceedings Paper

SPIRou @ CFHT: spectrograph optical design
Author(s): Simon Thibault; Patrick Rabou; Jean-Francois Donati; Pierre Desaulniers; Xavier Dallaire; Etienne Artigau; Francesco Pepe; Yoan Micheau; Philippe Vallée; Francesco Pepe; Greg Barrick; Vlad Reshetov; Olivier Hernandez; Leslie Saddlemyer; John Pazder; Laurent P. Parès; Rene Doyon; Xavier Delfosse; Driss Kouach; David Loop
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Paper Abstract

SPIRou is a near-infrared, echelle spectropolarimeter/velocimeter under design for the 3.6m Canada-France-Hawaii Telescope (CFHT) on Mauna Kea, Hawaii. The unique scientific capabilities and technical design features are described in the accompanying (eight) papers at this conference. In this paper we focus on the lens design of the optical spectrograph. The SPIROU spectrograph is a near infrared fiber fed double pass cross dispersed spectrograph. The cryogenic spectrograph is connected with the Cassegrain unit by the two science fibers. It is also fed by the fiber coming from the calibration box and RV reference module of the instrument. It includes 2 off-axis parabolas (1 in double pass), an echelle grating, a train of cross disperser prisms (in double pass), a flat folding mirror, a refractive camera and a detector. This paper describes the optical design of the spectrograph unit and estimates the performances. In particular, the echelle grating options are discussed as the goal grating is not available from the market.

Paper Details

Date Published: 24 September 2012
PDF: 11 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844630 (24 September 2012); doi: 10.1117/12.926697
Show Author Affiliations
Simon Thibault, Univ. Laval (Canada)
Patrick Rabou, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Jean-Francois Donati, Institut de Recherche en Astrophysique et Planétologie (France)
Pierre Desaulniers, Univ. Laval (Canada)
Xavier Dallaire, Univ. Laval (Canada)
Etienne Artigau, Univ. de Montréal (Canada)
Francesco Pepe, Observatoire de l'Univ. de Genève (Switzerland)
Yoan Micheau, Institut de Recherche en Astrophysique et Planétologie (France)
Philippe Vallée, Univ. de Montréal (Canada)
Francesco Pepe, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Greg Barrick, Canada-France-Hawaii Telescope (United States)
Vlad Reshetov, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Olivier Hernandez, Univ. de Montréal (Canada)
Leslie Saddlemyer, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
John Pazder, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Laurent P. Parès, Institut de Recherche en Astrophysique et Planétologie (France)
Rene Doyon, Univ. de Montréal (Canada)
Xavier Delfosse, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Driss Kouach, Institut de Recherche en Astrophysique et Planétologie (France)
David Loop, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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