At the ground layer, the footprints of the stars overlap completely and every star footprint illuminates the entire pupil-plane. However, for a higher layer, the footprints do not overlap completely and each star illuminates a different region of the conjugated plane. Lack of stars, therefore, results in some regions in this "meta-pupil"-plane not being illuminated, implying no information regarding the aberrations in these areas. The optimum way of correcting the high layer, given this limited information, is the crux of the "partial illumination issue". In this paper, we propose a solution for this issue and discuss laboratory results from the aligned LN bench in the lab. Currently, LN has completed the re-integration and re-alignment at LBT. In early June 2016, we tested our partial illumination algorithm in the instrument’s final configuration in the LBT mountain lab, using simulated stars. On sky testing will begin in late 2016.
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K. K. R. Santhakumari, C. Arcidiacono, T. Bertram, J. Berwein, T. M. Herbst, R. Ragazzoni, "Solving the MCAO partial illumination issue and laboratory results," Proc. SPIE 9909, Adaptive Optics Systems V, 99096M (27 July 2016);