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The RISTRETTO instrument is a high-contrast high-resolution integral field spectrograph, designed to observe and characterize nearby exoplanets located at 2 lambda/D from their host stars. RISTRETTO’s spectrograph will be fed by a high-contrast IFU consisting of 7 single-mode fiber (SMF) spaxels. In this context, the coronagraph is specified to provide at least 10-4 raw contrast at 2 l/D across the I-band. Two coronagraph designs are presented: (i) an amplitude ring-apodizer mask, and (ii) a PIAA-derived solution with improved throughput. Simulations including realistic XAO residuals and early laboratory results are shown. The foreseen SMF injection unit design is also detailed.
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Jonas G. Kühn, Nicolas Blind, Bruno Chazelas, Eddy Hocini, Christophe Lovis, "RISTRETTO: A high-throughput high-contrast coronagraphic IFU at two diffraction beam widths," Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121881T (29 August 2022); https://doi.org/10.1117/12.2627966