27 July 2010 Latest achievements of the MCAO testbed for the GREGOR Solar Telescope
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Abstract
The testbed of the MCAO for the new 1.5 meter solar telescope GREGOR is now operational. Most of the components will be moved to the telescope after commissioning. The testbed features 4 adaptive mirrors (1 tiptilt, and 3 DMs), and two Hartmann-Shack sensor units for wavefront tomography in a guide-region oriented approach. First system characteristics gained from setting up operation of the testbed are presented. We also comment on the effect of high-altitude deformable mirrors on subaperture alignment, and misregistration. We conclude that on-axis wavefront sensors should not be located behind high-altitude deformable mirrors. Furthermore, we present a general opto-geometric characteristic of micro-lens arrays needed for a Hartmann-Shack sensor which shall be used for extended fields of view - be it solar surface or laser guide stars, for example. This characteristic can be useful to have custom-made arrays manufactured for reasonable prices.
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Dirk Schmidt, Dirk Schmidt, Thomas Berkefeld, Thomas Berkefeld, Bernhard Feger, Bernhard Feger, Frank Heidecke, Frank Heidecke, } "Latest achievements of the MCAO testbed for the GREGOR Solar Telescope", Proc. SPIE 7736, Adaptive Optics Systems II, 773607 (27 July 2010); doi: 10.1117/12.857117; https://doi.org/10.1117/12.857117
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