24 September 2012 SPIRou @ CFHT: fiber links and pupil slicer
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Abstract
SPIRou is a near-IR (0.98-2.35μm), echelle spectropolarimeter / high precision velocimeter being designed as a next-generation instrument for the 3.6m Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, with the main goal of detecting Earth-like planets around low mass stars and magnetic fields of forming stars. The unique scientific and technical capabilities of SPIRou are described in a series of seven companion papers. In this paper, the fiber links which connects the polarimeter unit to the cryogenic spectrograph unit (35 meter apart) are described. The pupil slicer which forms a slit compatible with the spectrograph entrance specifications is also discussed in this paper. Some challenging aspects are presented. In particular this paper will focus on the manufacturing of 35 meter fibers with a very low loss attenuation (< 13dB/km) in the non-usual fiber spectral domain from 0.98 μm to 2.35 μm. Other aspects as the scrambling performance of the fiber links to reach high accuracy radial velocity measurements (1m/s) and the design of the pupil slicer exposed at a cryogenic and vacuum environment will be discussed.
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Yoan Micheau, François Bouchy, Francesco Pepe, Bruno Chazelas, Driss Kouach, Laurent Parès, Jean-François Donati, Gregory Barrick, Patrick Rabou, Simon Thibault, Leslie Saddlemyer, Sandrine Perruchot, Xavier Delfosse, Nicolas Striebig, Gérard Gallou, David Loop, John Pazder, "SPIRou @ CFHT: fiber links and pupil slicer", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84462R (24 September 2012); doi: 10.1117/12.926084; https://doi.org/10.1117/12.926084
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