26 July 2016 The adaptive optics system of the 1.5m GREGOR solar telescope: four years of operation
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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.
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Thomas Berkefeld, Thomas Berkefeld, Dirk Schmidt, Dirk Schmidt, Dirk Soltau, Dirk Soltau, Frank Heidecke, Frank Heidecke, Andreas Fischer, Andreas Fischer, } "The adaptive optics system of the 1.5m GREGOR solar telescope: four years of operation", Proc. SPIE 9909, Adaptive Optics Systems V, 990924 (26 July 2016); doi: 10.1117/12.2232604; https://doi.org/10.1117/12.2232604
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