Abstract:The largest existing optical telescopes and the next generation of extremely large telescopes are all segmented telescopes. The primary mirror segments must be phased in order to attain the diffraction limit of the telescope. In this paper, we investigate the effect of phasing errors on image quality delivered by the adaptive optics systems at the W. M. Keck Observatory using both simulations and on-sky data. We show that a Shack-Hartmann wavefront sensor is able to measure moderate phasing errors, which can b… Show more
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