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MOAO first on-sky demonstration with CANARY

Abstract : Context. A new challenging adaptive optics (AO) system, called multi-object adaptive optics (MOAO), has been successfully demonstrated on-sky for the first time at the 4.2 m William Herschel Telescope, Canary Islands, Spain, at the end of September 2010.
Aims: This system, called CANARY, is aimed at demonstrating the feasibility of MOAO in preparation of a future multi-object near infra-red (IR) integral field unit spectrograph to equip extremely large telescopes for analysing the morphology and dynamics of high-z galaxies.
Methods: CANARY compensates for the atmospheric turbulence with a deformable mirror driven in open-loop and controlled through a tomographic reconstruction by three widely separated off-axis natural guide star (NGS) wavefront sensors, which are in open loop too. We compared the performance of conventional closed-loop AO, MOAO, and ground-layer adaptive optics (GLAO) by analysing both IR images and simultaneous wave-front measurements.
Results: In H-band, Strehl ratios of 0.20 are measured with MOAO while achieving 0.25 with closed-loop AO in fairly similar seeing conditions (r0 ≈ 15 cm at 0.5 mum). As expected, MOAO has performed at an intermediate level between GLAO and closed-loop AO.
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Submitted on : Sunday, October 2, 2022 - 9:05:09 AM
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Éric Gendron, Fabrice Vidal, Matthieu Brangier, Timothy J. Morris, Zoltan Hubert, et al.. MOAO first on-sky demonstration with CANARY. Astronomy and Astrophysics - A&A, 2011, 529, pp.L2. ⟨10.1051/0004-6361/201116658⟩. ⟨hal-03786137⟩



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