Tests and characterisations of the ALPAO 64×64 deformable mirror, the MICADO-MAORY SCAO AIT facility - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Tests and characterisations of the ALPAO 64×64 deformable mirror, the MICADO-MAORY SCAO AIT facility

Jordan Raffard
  • Fonction : Auteur
Eric Gendron
  • Fonction : Auteur
  • PersonId : 828766
Simone Thijs
  • Fonction : Auteur
Vincent Lapeyrère
  • Fonction : Auteur
Jean-Tristan Buey
  • Fonction : Auteur
Yann Clénet
Damien Gratadour
Arnaud Sevin
  • Fonction : Auteur
Florian Moura Ferreira
  • Fonction : Auteur
Pierre Mahiou
  • Fonction : Auteur

Résumé

MICADO is the ELT near-infrared first light imager. It will provide diffraction limited images using the singleconjugate adaptive optics (SCAO) mode developed inside the MAORY AO module. Although the MICADO-MAORY SCAO mode uses during regular operations the ELT wavefront correction capabilities (M4 & M5 adaptive mirrors), the SCAO system will not be able to work with them until the final instrument commissioning. Since it is crucial to test and validate the SCAO system during various AITs phases in Europe, the need of a high order deformable mirror with comparable number of degrees of freedom is required to test both spatial and temporal behaviour of the SCAO mode. For that purpose, the SCAO AITs in Europe will use the newly developed ALPAO 64×64 actuators deformable mirror (DM). Before using this deformable mirror in the context of the SCAO mode (i.e controlled by a non-linear pyramid WFS, we built a classical Shack-Hartmann WFS to ensure a proper linear wavefront measurement in the lab and perform the DM characterisation of its 3228 actuators. We present the preliminary results of the tests performed on this DM in a classical closed loop scheme. In particular we study the spatial wavefront correction, actuators additivity and linear response, maximum amplitude range (stroke), hysteresis and temporal stability.
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Dates et versions

hal-03084885 , version 1 (21-12-2020)

Identifiants

  • HAL Id : hal-03084885 , version 1

Citer

Fabrice Vidal, Jordan Raffard, Eric Gendron, Simone Thijs, Vincent Lapeyrère, et al.. Tests and characterisations of the ALPAO 64×64 deformable mirror, the MICADO-MAORY SCAO AIT facility. Adaptive Optics for Extremely Large Telescopes conference, 6th edition, Nov 2019, Québec, France. ⟨hal-03084885⟩
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