RISTRETTO: A high-throughput high-contrast coronagraphic IFU at two diffraction beam widths

Jonas G. Kühn; Nicolas Blind; Bruno Chazelas; Eddy Hocini; Christophe Lovis

doi:10.1117/12.2627966

29 August 2022 RISTRETTO: A high-throughput high-contrast coronagraphic IFU at two diffraction beam widths

Jonas G. Kühn, Nicolas Blind, Bruno Chazelas, Eddy Hocini, Christophe Lovis

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121881T (2022) https://doi.org/10.1117/12.2627966
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

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.

Conference Presentation

Citation Download Citation

Jonas G. Kühn, Nicolas Blind, Bruno Chazelas, Eddy Hocini, and 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

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