Technical requirements and optical design of the Hi-5 spectrometer

Conference paper (2022)

Authors

C. Dandumont ULiège, Université de Liège
A. Mazzoli Université de Liège, ULiège
Victor Laborde Université de Liège, ULiège
Romain Laugier Katholieke Universiteit Leuven
A. Bigioli Katholieke Universiteit Leuven
G. Garreau Katholieke Universiteit Leuven
S Gross Macquarie University
M. Ireland Australian National University
J.J.D. Loicq ULiège, Spaceborne Instrumentation - Aerospace Engineering
More Authors... External organisation
Research Group
Spaceborne Instrumentation (Aerospace Engineering) (TU Delft)
Copyright: © 2022 C. Dandumont, A. Mazzoli, Victor Laborde, Romain Laugier, A. Bigioli, G. Garreau, S. Gross, M. Ireland, J.J.D. Loicq, More Authors
DOI: https://doi.org/10.1117/12.2627939
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Published Date

2022

Language

English

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Faculty

Aerospace Engineering

Department

Space Engineering

Research Group

Spaceborne Instrumentation

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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