On the road to the Preliminary Design Review of the MAORY adaptive optics module for ELT

Diolaiti, Emiliano

doi:10.26698/ao4elt5.0169

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…This is again due to long propagation distances: the post-focal DMs are conjugated to 15.5 km and 4.5 km in the current plans. 12 All simulations have been perfomed at zenith but it has been shown that airmass is also a factor in further reducing the Strehl ratio due to this effect. 1…”

Section: Wave-optical Simulation and Resultsmentioning

confidence: 99%

Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?

Farley¹,

Osborn²,

Morris³

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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To achieve the best correction using a multi-conjugate adaptive optics (MCAO) system, the sequence of the deformable mirrors must be taken into account. Since atmospheric turbulence is sampled from high to low altitude, the subsequent phase corrections must be performed in a symmetrical way (low to high altitude) to avoid aberration arising from optical propagation through the system. This is a well known problem in solar MCAO however ordering the DMs in this way requires bulky relay optics, therefore most post focal MCAO systems for night-time astronomy have been designed with the DMs ordered from high to low altitude. We show that this results in a small wavefront error that can become nonnegligible in the visible. Employing an adaptive secondary mirror conjugated to the ground has the potential to alleviate this effect.

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Section: Wave-optical Simulation and Resultsmentioning

confidence: 99%

Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?

Farley¹,

Osborn²,

Morris³

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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“…• HARMONI combinera un système d'OA classique fonctionnant sur objets brillants (magnitude plus faible que 12/13 typiquement) et un système de LTAO [17] utilisant le miroir adaptatif de l'ELT (M4), 6 LGS (équi-réparties sur un cercle d'un peu plus d'une minute d'arc de diamètre) et une seule NGS avec une magnitude limite de 18-19 en H pour la mesure du tilt atmosphérique et la correction des aberrations induites par les limitations de la LGS (voir [5]). • MICADO combinera un système d'OA classique fonctionnant sur objets brillants très similaires à celui d'HARMONI (magnitude plus faible que 12/13 typiquement) et le système de MCAO MORFEO [18] utilisant 1 miroir déformable supplémentaire conjugué optiquement à environ 12 km d'altitude en complément du miroir adaptatif de l'ELT (M4), 6 LGS (équi-réparties sur un cercle de 1,5 min d'arc de diamètre) et 3 étoiles naturelles avec une magnitude limite de 18 en bande H et disponibles dans un champ de vue de près de 2,7 min d'arc de diamètre.…”

Section: Les Nouveaux Télescopes Géants : Nouveaux Défis Nouvelles So...unclassified

Optique adaptative et telescopes geants

Fusco¹

2023

Comptes Rendus. Mécanique

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L'optique adaptative, installée sur tous les très grands télescopes astronomiques, permet de s'affranchir des limitations imposées par les perturbations de la turbulence atmosphérique. Cet article présente l'état de l'art du domaine pour les applications astronomiques et comment l'optique adaptative a révolutionné l'observation astronomique depuis le sol ces vingt dernières années en relevant d'innombrables défis scientifiques et techniques. Nous présentons enfin comment le concept va être appliqué, à l'horizon 2030 sur les futurs télescopes géants afin de répondre à certaines des questions les plus fondamentales de l'astronomie concernant la naissance de l'univers ou l'existence de la vie hors du système solaire.

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“…Most of the existing 8m class telescopes today has, or will have in the nar future, a built-in adaptive device, namely a secondary adaptive mirror [11] . This device is usually conjugated very close to the ground layer.…”

Section: A Matter Of Actuatorsmentioning

confidence: 99%

“…In this context, MCAO become enough mature to push its limits, on one hand toward the largest foreseen apertures, like in MAORY for the ELT [11] or to achieve it on existing 8m class telescopes but on a much shorter wavelength, opening in principle a straight competition with current and short term planned space telescopes facility like HST and JWST.…”

Section: Introductionmentioning

confidence: 99%

Hierarchichal-segmented AO in order to attain wide field compensation in the visible on an 8m class telescope.

Ragazzoni¹,

Magrin²,

Farinato³

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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We describe the preliminary optimized layout for a partially optimized concept of an optical-8m class VLT-like 2x2 segmented camera where each channel is assisted by an equivalent of an MCAO system where the ground layer correction is commonly employed while the high altitude ones is performed in an open-loop fashion. While we derive the basic relationships among the Field of View and attainable correction with a pre-defined choice for the hardware, we discuss sky coverage and wavefront sensing issues employing natural and artificial references, involving the latest stateof-the-art in the development of wavefront sensing. We show that a flexible approach allow for a compensated Field of View that is variable and can be properly tuned matching the current turbulence situation and the requirement in term of quality of the compensation. A preliminary description of the overall optomechanical package is given as well along with a rough estimates of the efforts required to translates such a concept into reality.

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On the road to the Preliminary Design Review of the MAORY adaptive optics module for ELT

Abstract: The MAORY adaptive optics module will enable high angular resolution observations in the near infrared on the European ELT. This paper describes the current instrument design.

Cited by 4 publications

References 12 publications

Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?

Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?

Optique adaptative et telescopes geants

Hierarchichal-segmented AO in order to attain wide field compensation in the visible on an 8m class telescope.

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