GRAAL: a seeing enhancer for the NIR wide-field imager Hawk-I

J. Paufique; A. Bruton; A. Glindemann; A. Jost; J. Kolb; L. Jochum; M. Le Louarn; M. Kiekebusch; N. Hubin; P.-Y. Madec; R. Conzelmann; R. Siebenmorgen; R. Donaldson; R. Arsenault; S. Tordo

doi:10.1117/12.858261

27 July 2010 GRAAL: a seeing enhancer for the NIR wide-field imager Hawk-I

J. Paufique, A. Bruton, A. Glindemann, A. Jost, J. Kolb, L. Jochum, M. Le Louarn, M. Kiekebusch, N. Hubin, P.-Y. Madec, R. Conzelmann, R. Siebenmorgen, R. Donaldson, R. Arsenault, S. Tordo

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 77361P (2010) https://doi.org/10.1117/12.858261
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

We describe the design and development status of GRAAL, the Ground-layer adaptive optics assisted by Laser, which will deliver enhanced images to the Hawk-I instrument on the VLT. GRAAL is an adaptive optics module, part of AOF, the Adaptive optics facility, using four Laser- and one natural guide-stars to measure the turbulence, and correcting for it by deforming the adaptive secondary mirror of a Unit telescope in the Paranal observatory. The outstanding feature of GRAAL is the extremely wide field of view correction, over 10 arcmin diameter, with an image enhancement of about 20% in average in K band. When observing GRAAL will provide FWHM better than 0.3" 40% of the time. Besides the Adaptive optics facility deformable mirror and Laser guide stars, the system uses subelectron L3-CCD and a real-time computing platform, SPARTA. GRAAL completed early this year a final design phase shared internally and outsourced for its mechanical part by the Spanish company NTE. It is now in manufacturing, with a first light in the laboratory planned in 2011.

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J. Paufique, A. Bruton, A. Glindemann, A. Jost, J. Kolb, L. Jochum, M. Le Louarn, M. Kiekebusch, N. Hubin, P.-Y. Madec, R. Conzelmann, R. Siebenmorgen, R. Donaldson, R. Arsenault, and S. Tordo "GRAAL: a seeing enhancer for the NIR wide-field imager Hawk-I", Proc. SPIE 7736, Adaptive Optics Systems II, 77361P (27 July 2010); https://doi.org/10.1117/12.858261

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