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Proceedings Paper

The adaptive optics system of the 1.5m GREGOR solar telescope: four years of operation
Author(s): Thomas Berkefeld; Dirk Schmidt; Dirk Soltau; Frank Heidecke; Andreas Fischer
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Paper Abstract

We present the properties of the adaptive optics (AO) system of the German 1.5m solar telescope GREGOR, located on the island of Tenerife, Spain. The conventional AO system uses a correlating Shack-Hartmann-Sensor with a 92mm subaperture size and a 256-actuator stacked-piezo deformable mirror (DM). AO performance results and practical experience based on the last four years of operation are presented. A recently installed second wavefront sensor with exchangeable lenslets / subaperture sizes in combination with an EM-CCD camera is used for low light observations such as polarimetric measurements of the solar system planets. Further developments include algorithmic improvements, the use of the night-time sensor for solar (off-limb) observations and solar MCAO.

Paper Details

Date Published: 26 July 2016
PDF: 7 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 990924 (26 July 2016); doi: 10.1117/12.2232604
Show Author Affiliations
Thomas Berkefeld, Kiepenheuer-Institut für Sonnenphysik (Germany)
Dirk Schmidt, National Solar Observatory (United States)
Dirk Soltau, Kiepenheuer-Institut für Sonnenphysik (Germany)
Frank Heidecke, Kiepenheuer-Institut für Sonnenphysik (Germany)
Andreas Fischer, Kiepenheuer-Institut für Sonnenphysik (Germany)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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