HARMONI - first light spectroscopy for the ELT: final design of the integral field unit

Magali Loupias; Johan Richard; Alban Remillieux; Jean-Emmanuel Migniau; Florence Laurent; Alexandre Jeanneau; Karen Disseau; Eric Daguise; Diane Chapuis; Didier Boudon; Nicolas Bouché; Hermine Schnetler; Ian Bryson; Dave Melotte; Angus Gallie; Niranjan A. Thatte; Fraser Clarke; Matthias Tecza; Edgard Renault; Johan Kosmalski

doi:10.1117/12.2561374

13 December 2020 HARMONI - first light spectroscopy for the ELT: final design of the integral field unit

Magali Loupias, Johan Richard, Alban Remillieux, Jean-Emmanuel Migniau, Florence Laurent, Alexandre Jeanneau, Karen Disseau, Eric Daguise, Diane Chapuis, Didier Boudon, Nicolas Bouché, Hermine Schnetler, Ian Bryson, Dave Melotte, Angus Gallie, Niranjan A. Thatte, Fraser Clarke, Matthias Tecza, Edgard Renault, Johan Kosmalski

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Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 1145138 (2020) https://doi.org/10.1117/12.2561374
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

HARMONI is the ELT first light visible and near-infrared (0.45 to 2.45 μm) integral field spectrograph over a range of resolving power from R~3500 to R~18000. It will provide 4 different spatial scales from 4*4mas to 30*60mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. This paper depicts the final design of the Integral Field Unit in charge of splitting, slicing and rearranging the rectangular field of view into 4 long slits (~540mm) to feed the 4 spectrographs. The manufacturing of sensitive optics such as the field splitter or the image slicer are detailed. The mechanical and alignment design strategy is explained as well as the design of some dedicated integration tools, developed for cryogenic environment. The performances of the full unit are deeply discussed in terms of image quality, straylight analysis, tolerancing.

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Magali Loupias, Johan Richard, Alban Remillieux, Jean-Emmanuel Migniau, Florence Laurent, Alexandre Jeanneau, Karen Disseau, Eric Daguise, Diane Chapuis, Didier Boudon, Nicolas Bouché, Hermine Schnetler, Ian Bryson, Dave Melotte, Angus Gallie, Niranjan A. Thatte, Fraser Clarke, Matthias Tecza, Edgard Renault, and Johan Kosmalski "HARMONI - first light spectroscopy for the ELT: final design of the integral field unit", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145138 (13 December 2020); https://doi.org/10.1117/12.2561374

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