Bruno Chazelas,1 Christophe Lovis,1 Nicolas Blind,1 Ludovic Genolet,1 Ian Hughes,1 Michael Sordet,1 Robin Schnell,1 Anthony Carvalho,1 Maddalena Bugatti1
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The RISTRETTO project is aiming to build an instrument that will detect the reflected light from close-by exoplanet. It is a two stage instrument: An extreme AO system in the visible, followed by a seven spaxel single mode High resolution Spectrograph. In this paper we present the design of this spectrograph: a classical echelle spectrograph fed with single mode fibers. Standard single mode fibers have been chosen and are forming a long tilted slit in order to have the right order spacing on the detector. The instrument will be under vacuum and thermally controlled in order to make it stable.
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Bruno Chazelas, Christophe Lovis, Nicolas Blind, Ludovic Genolet, Ian Hughes, Michael Sordet, Robin Schnell, Anthony Carvalho, Maddalena Bugatti, "RISTRETTO: seven spaxel single mode spectrograph design," Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121844T (29 August 2022); https://doi.org/10.1117/12.2629907