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Laser Guide Stars aim at increasing the sky coverage, highly restricted when using Adaptive Optics with Natural Guide Stars. With such an artificial object, spot elongation may be a limitation for the measurement quality when using a Wave Front Sensor. In this document, we evaluate and discuss the effects of this limitation on wave front measurements, for a 40 m class telescope. We also explore the possibilities of taking these effects into account in the wave front reconstruction.

Anisoplanatism effects in Shack-Hartmann Wave Front Sensing with Laser Guide Stars on the ELTs