A flexible adaptive optics concept for general purpose high angular resolution science on the DAG 4 m telescope

Jolissaint, Laurent (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Bouxin, Audrey (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Gökay, Ulas S. (Işık Unıversity, Turkey) ; Keskin, Onur (Işık Unıversity, Turkey) ; Rigaut, François (Research School of Astronomy and Astrophysics, The Australian National University, Australia) ; Yesilyaprak, Cahit (Atatürk University, Turkey)

Thanks to the availability of high actuator density deformable mirrors (ALPAO 468 DM), the high versatility of the pyramid wavefront sensor and above all, the venue of essentially no noise EMCCD detectors, it becomes possible to fully adapt the degree of correction of an adaptive optics system for a given guide star brightness and atmospheric condition. Indeed, when the conditions are very good, the high actuator density of the DM allows to reach a high Strehl by using all the modes, and when the conditions are less favorable, the spatial sampling, i. the number of modes, and the sensitivity of the detector allows to maximize the Strehl beyond what would be possible with a classical, frozen SH-WFS based system. Beside, oversampling the detector allows to relax the specification on the pupil images given by the pyramid on the detector, which in turn relaxes the pyramid prism manufacturing specifications. We are now designing an AO system for the DAG 4 m telescope that will allow, on the same system, ExAO as well as low order improved seeing observations. This article reports on the AO performance analysis, the final optical design and the design of the double prism achromatic pyramid.


Keywords:
Conference Type:
full paper
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
iAi-Institut d'Automatisation Industrielle
Subject(s):
Ingénierie
Publisher:
Austin, TX, USA, 10-15 June 2018
Date:
2018-07
Austin, TX, USA
10-15 June 2018
Pagination:
12 p.
Published in:
Proceedings of SPIE. Adaptive Optics Systems VI, 10 - 15 June 2018, Austin, Texas, United States
Numeration (vol. no.):
2018, vol. VI, article no. 1070366
DOI:
ISSN:
1559-128X
Appears in Collection:



 Record created 2018-12-04, last modified 2018-12-20

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