24 September 2012 SPIRou @ CFHT: spectrograph optical design
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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.
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Simon Thibault, Simon Thibault, Patrick Rabou, Patrick Rabou, Jean-Francois Donati, Jean-Francois Donati, Pierre Desaulniers, Pierre Desaulniers, Xavier Dallaire, Xavier Dallaire, Etienne Artigau, Etienne Artigau, Francesco Pepe, Francesco Pepe, Yoan Micheau, Yoan Micheau, Philippe Vallée, Philippe Vallée, Francesco Pepe, Francesco Pepe, Greg Barrick, Greg Barrick, Vlad Reshetov, Vlad Reshetov, Olivier Hernandez, Olivier Hernandez, Leslie Saddlemyer, Leslie Saddlemyer, John Pazder, John Pazder, Laurent P. Parès, Laurent P. Parès, Rene Doyon, Rene Doyon, Xavier Delfosse, Xavier Delfosse, Driss Kouach, Driss Kouach, David Loop, David Loop, } "SPIRou @ CFHT: spectrograph optical design", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844630 (24 September 2012); doi: 10.1117/12.926697; https://doi.org/10.1117/12.926697
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