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29 August 2022 HARMONI at ELT: Getting to the Diffraction limit!
Benoît Neichel, Thierry Fusco, Jean-François Sauvage, Carlos Correia, Lisa Bardou, Tim Morris, Kjetil Dohlen, Kacem El Hadi, David Le Mignant, Anne Costille, Niranjan Thatte, Fraser Clarke, Dave Melotte, Oscar Gonzalez, Matthias Tecza, Hermine Schnetler
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Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218515 (2022) https://doi.org/10.1117/12.2629284
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
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 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. In this paper, we present the system choices that have been made for the SCAO and LTAO modules. We describe the strategy developed for the different Wave-Front Sensors: pyramid for SCAO, the LGSWFS concept, the NGSWFS path, and the truth sensor capabilities. With this talk we intend to provide a general overview of the performance and operations for the AO modes of HARMONI. As such, we will also present the overall integration of the AO modules within the HARMONI instrument, and a full end-to-end simulation of the expected performance once at the telescope
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Benoît Neichel, Thierry Fusco, Jean-François Sauvage, Carlos Correia, Lisa Bardou, Tim Morris, Kjetil Dohlen, Kacem El Hadi, David Le Mignant, Anne Costille, Niranjan Thatte, Fraser Clarke, Dave Melotte, Oscar Gonzalez, Matthias Tecza, and Hermine Schnetler "HARMONI at ELT: Getting to the Diffraction limit!", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218515 (29 August 2022); https://doi.org/10.1117/12.2629284
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KEYWORDS
Diffraction
Adaptive optics
Calibration
Optical tracking
Sensors
Visible radiation
Optical calibration
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