15 July 2008 Adaptive optics simulations for the European Extremely Large Telescope
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Abstract
Simulations of adaptive optics (AO) for the European extremely large telescope (EELT) are presented. For Shack-Hartmann wavefront sensors for the laser guide star (LGS) based systems, the simulations show that without the Rayleigh fratricide effect, central projection of the laser is preferable to side projection, the correlation or matched filter centroiding algorithms offer superior performance to a traditional center-of-gravity approach, the optimum sampling of the detector is approximately 1.5 pixels per FWHM of the non-elongated spot, and that at least 10×10 pixels are required. The required number of photo-detection events from the LGS per frame per subaperture is of the order of 1000. Correction of segmentation errors with a Shack-Hartmann wavefront sensor (WFS) has also been investigated; atmospheric turbulence dominates these segmentation errors. The pyramid WFS is also simulated for the EELT, showing that modulation of the pyramid will be necessary.
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Richard M. Clare, Miska Le Louarn, Sylvain Oberti, A. Garcia-Rissmann, "Adaptive optics simulations for the European Extremely Large Telescope", Proc. SPIE 7015, Adaptive Optics Systems, 701572 (15 July 2008); doi: 10.1117/12.787201; https://doi.org/10.1117/12.787201
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