We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-apertures it is possible to further increase performance and maintain equivalent performance even for large off-axis angles.
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Noah Schwartz, Jean-François Sauvage, Carlos Correia, Benoît Neichel, Léonardo Blanco, Thierry Fusco, Arlette Pécontal-Rousset, Aurélien Jarno, Laure Piqueras, Kjetil Dohlen, Kacem El Hadi, Niranjan Thatte, Ian Bryson, Fraser Clarke, Hermine Schnetler, "Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO," Proc. SPIE 9909, Adaptive Optics Systems V, 990978 (27 July 2016);