METIS for ELT: optical alignment and testing of the IFU of the LM-band spectrometer

Lawrence Bissell; Éamonn Harvey; Stephen Todd; Valentina Oyarzun; Alastair Macleod; Sandi Wilson; Alistair Glasse; Daniel Dicken; Felix Bettonvil; Bernhard Brandl

arXiv · 2607.22311

METIS for ELT: optical alignment and testing of the IFU of the LM-band spectrometer

Lawrence Bissell·Éamonn Harvey·Stephen Todd·Valentina Oyarzun·Alastair Macleod·Sandi Wilson·Alistair Glasse·Daniel Dicken·Felix Bettonvil·Bernhard Brandl

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Abstract

The METIS LMS (LM-band Spectrometer) is a high-resolution (R>100,000) mid-infrared integral field spectrometer for the ESO ELT. The instrument provides the capability to measure instantaneous spectra across a 0.577 x 0.897 arcsecond field-of-view with a spatial sampling of 8.2-9.1 mas using an image slicing IFU. This paper presents the optical testing and alignment performed for the IFU sub-system. This includes the detailed characterisation of the image slicing mirror array measured via: a re-imaging test in which the slicer is positioned to re-image a point source to form 28 images due to the different tilts of the 28 slicer mirrors; and precise interferometric measurements of each of the image slicer mirrors. The paper will also give an overview of the optical alignment strategy employed during the IFU AIT process in order to reach the tight alignment requirements.

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BibTeX RIS

Lawrence Bissell, Éamonn Harvey, Stephen Todd, Valentina Oyarzun, Alastair Macleod, Sandi Wilson, Alistair Glasse, Daniel Dicken, Felix Bettonvil, Bernhard Brandl. 2026-07-24. METIS for ELT: optical alignment and testing of the IFU of the LM-band spectrometer. https://arxiv.org/abs/2607.22311

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