Technical requirements and optical design of the Hi-5 spectrometer

C. Dandumont; A. Mazzoli; V. Laborde; R. Laugier; A. Bigioli; G. Garreau; S. Gross; M. Ireland; H.-D. Kenchington Goldsmith; L. Labadie; M.-A. Martinod; G. Raskin; A. Sanny; J. Loicq; D. Defrère

doi:10.1117/12.2627939

26 August 2022 Technical requirements and optical design of the Hi-5 spectrometer

C. Dandumont, A. Mazzoli, V. Laborde, R. Laugier, A. Bigioli, G. Garreau, S. Gross, M. Ireland, H.-D. Kenchington Goldsmith, L. Labadie, M.-A. Martinod, G. Raskin, A. Sanny, J. Loicq, D. Defrère

Author Affiliations +

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 121831Y (2022) https://doi.org/10.1117/12.2627939
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Hi-5 is a proposed L' band high-contrast nulling interferometric instrument for the visitor focus of the Very Large Telescope Interferometer (VLTI). As a part of the ERC consolidator project called SCIFY (Self-Calibrated Interferometry For exoplanet spectroscopY), the instrument aims to achieve sufficient dynamic range and angular resolution to directly image and characterize the snow line of young extra-solar planetary systems. The spectrometer is based on a dispersive grism and is located downstream of an integrated optics beam-combiner. To reach the contrast and sensitivity specifications, the outputs of the I/O chip must be sufficiently separated and properly sampled on the Hawaii-2RG detector. This has many implications for the photonic chip and spectrometer design. We present these technical requirements, trade-off studies, and phase-A of the optical design of the Hi-5 spectrometer in this paper. For both science and contract-driven reasons, the instrument design currently features three different spectroscopic modes (R=20, 400, and 2000). Designs and efficiency estimates for the grisms are also presented as well as the strategy to separate the two polarization states.

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C. Dandumont, A. Mazzoli, V. Laborde, R. Laugier, A. Bigioli, G. Garreau, S. Gross, M. Ireland, H.-D. Kenchington Goldsmith, L. Labadie, M.-A. Martinod, G. Raskin, A. Sanny, J. Loicq, and D. Defrère "Technical requirements and optical design of the Hi-5 spectrometer", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121831Y (26 August 2022); https://doi.org/10.1117/12.2627939

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