HARMONI at ELT: adaptive optics calibration unit from design to prototyping - ONERA - Office national d'études et de recherches aérospatiales Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

HARMONI at ELT: adaptive optics calibration unit from design to prototyping

Résumé

In this paper, we present the design and prototyping of the HARMONI Adaptive Optics Calibration Unit (AOCU). The AOCU consists of a set of on-axis sources (covering 0.5-2.4 µm) with a controllable wavefront shape. It will deploy into the instrument focal plane to inject calibration light into the rest of the system. The AOCU supports all-natural guide-star wavefront sensors for SCAO, HCAO, and LTAO. The AOCU will be used to calibrate the WFSs, the internal interaction matrices of HARMONI, measure and compensate NCPAs between AO dichroics and the science detectors, and calibrate the pointing model zero position. The illumination assembly of the AOCU will consist of six diffraction-limited sources and a resolved source coupled into fibres. Because of the wide range of wavelengths and the spatial separations requirements, we use two endlessly single-mode fibres and a multimode fibre. In addition, several LED sources need to be coupled efficiently into the single-mode fibres. In this paper, we present the general AOCU design using off-the-shelf with a focus on the illumination and source module.
Fichier principal
Vignette du fichier
121855E.pdf (927.65 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03796039 , version 1 (05-10-2022)

Identifiants

Citer

Noah Schwartz, Edgard Renault, William Ceria, Martin Black, Kjetil Dohlen, et al.. HARMONI at ELT: adaptive optics calibration unit from design to prototyping. Proceedings SPIE Adaptive Optics Systems VIII, Jul 2022, Montréal, Canada. pp.203, ⟨10.1117/12.2627247⟩. ⟨hal-03796039⟩
16 Consultations
54 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More