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Multi-conjugate adaptive optics (MCAO) aims to overcome the problem of anisoplanatism, allowing astronomers to access large regions of the sky with good adaptive optics correction. A source of error unique to MCAO systems is the generalised fitting error, which is a consequence of the finite number of deformable mirrors available to correct for a continuous turbulence profile. I will present my work on a pedagogical approach to understanding the generalised fitting error and demonstrate the use of such an approach in analysis of MCAO design. |
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