HARMONI: the Extremely Large Telescope first light integral field spectrograph: analysis of toroidal mirrors in pre-optics: tolerance analysis and manufacturing error compensation

M. A. Cagigas; A. Pérez; M. Wells; H. Schnetler; A. Girardot; A. Alonso; B. García-Lorenzo; S. Regalado

doi:10.1117/12.2628782

29 August 2022 HARMONI: the Extremely Large Telescope first light integral field spectrograph: analysis of toroidal mirrors in pre-optics: tolerance analysis and manufacturing error compensation

M. A. Cagigas, A. Pérez, M. Wells, H. Schnetler, A. Girardot, A. Alonso, B. García-Lorenzo, S. Regalado

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121883M (2022) https://doi.org/10.1117/12.2628782
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It will use an image slicer to provide spectra over a single contiguous area, providing fields of view on the sky of 9.3x6.3”, 4.2x3.1”, 2.1x1.5” and 0.84x0.62” with increasing spatial resolution (i.e.- 60x30, 20x20, 10x10 and 4x4 mas2) and magnification 2, 3/6, 6/12 and 15/30 respectively. The anamorphic magnifications in 20x20, 10x10 and 4x4 scales are implemented using two toroidal mirrors in each optical path. In this paper, we present a complete tolerance analysis for the anamorphic stages and a compensation procedure to ensure the requirements of the system.

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M. A. Cagigas, A. Pérez, M. Wells, H. Schnetler, A. Girardot, A. Alonso, B. García-Lorenzo, and S. Regalado "HARMONI: the Extremely Large Telescope first light integral field spectrograph: analysis of toroidal mirrors in pre-optics: tolerance analysis and manufacturing error compensation", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121883M (29 August 2022); https://doi.org/10.1117/12.2628782

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