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Wide field Adaptive Optics (AO) is the branch of AO that aims to deliver compensation of atmospheric turbulence for ground-based optical telescope over patches of sky larger than the isoplanatic patch imposed by the nature of turbulence - typically 10 to 20" - delivered by the so-called Single-Conjugate AO. In this talk - a rehash of a keynote talk delivered at the Wide-Field AO workshop in Tokyo earlier this year - I will review Wide-Field AO (WFAO) systems, and explain their principles and how they beat fundamental limitations on both wavefront sensing and phase compensation. I will also review the various type of WFAO breeds, including GLAO, MCAO and MOAO, with some illustrating example systems. |
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