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. Defrere

OPTICAL AND INFRARED INTERFEROMETRY AND IMAGING VIII（2022）

Cited 2|Views59

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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Key words

interferometry,nulling,exoplanets,astronomy,spectrometer,optical design

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