An N-band test bench for the METIS coronagraphic masks

Samuel Ronayette; Salima Mouzali; Jean-Christophe Barrière; Éric Pantin; Thierry Orduna; Pascal Gallais; Michel Lortholary; Luc Dumaye; Olivier Absil; Christian Delacroix; Derek Ives; Mikael Karlsson

doi:10.1117/12.2562261

15 December 2020 An N-band test bench for the METIS coronagraphic masks

Samuel Ronayette, Salima Mouzali, Jean-Christophe Barrière, Éric Pantin, Thierry Orduna, Pascal Gallais, Michel Lortholary, Luc Dumaye, Olivier Absil, Christian Delacroix, Derek Ives, Mikael Karlsson

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114472U (2020) https://doi.org/10.1117/12.2562261
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

METIS is one of the first three instruments for the ELT, Europe’s next-generation ground-based telescope. It will offer imaging, coronagraphy and spectroscopy in the L, M and N bands for general-purpose science in astrophysics. Among its main science drivers are circumstellar disks and extrasolar planets observations, which requires demanding high contrast imaging techniques. In that framework, METIS will be equipped with state-of-the-art phase mask coronagraphs: Apodizing Phase Plate (APP) and Annular Grooves Phase Mask (AGPM). Manufacturing the AGPM coronagraphs is a complex process that requires performance assessment with specific testing before implementation into the instrument. At Department of Astrophysics (CEA Saclay, France), responsible for the testing of the N-band AGPMs, a previously available test bench with a telescope simulator and cryogenic facility has been upgraded to comply with the AGPM tests requirements. This paper presents these requirements and describes the test bench design adopted. Then, based on preliminary results, we discuss the original solutions that permitted to reach our goals.

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Samuel Ronayette, Salima Mouzali, Jean-Christophe Barrière, Éric Pantin, Thierry Orduna, Pascal Gallais, Michel Lortholary, Luc Dumaye, Olivier Absil, Christian Delacroix, Derek Ives, and Mikael Karlsson "An N-band test bench for the METIS coronagraphic masks", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114472U (15 December 2020); https://doi.org/10.1117/12.2562261

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