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Laser Guide Star (LGS) Shack-Hartmann (SH) wavefront sensors for nextgeneration Extremely Large Telescopes (ELTs) require low-noise, large format(about 1Mpx), fast detectors to match the need for a large number ofsubapertures and a good sampling of the very elongated spots. One pathenvisaged to fulfill this need has been the adoption of CMOS detectors with arolling shutter read-out scheme, that allows low read-out noise and fastreadout time at the cost of image distortion due to the detector rows exposedin different moments. In this work we analyze the impact of the rolling shutterread-out scheme when used for LGS SH wavefront sensing of the Multiconjugateadaptive Optic Relay For ELT Observations (MORFEO, formerly known as MAORY) forESO ELT; in particular, we focus on the impact on the adaptive opticscorrection of the distortion-induced aberrations created by the rollingexposure in the case of fast varying aberrations, like the ones coming from theLGS tilt jitter due to the up-link propagation of laser beams. We show that theLGS jitter-induced aberration for MORFEO can be as large as 100nm rms and wediscuss possible mitigation strategies.

MAORY/MORFEO and rolling shutter induced aberrations in laser guide star wavefront sensing