SPIRou @ CFHT: fiber links and pupil slicer
2012
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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