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29 August 2022 Visible extreme adaptive optics for GMagAO-X with the triple-stage AO architecture (TSAO)
Sebastiaan Y. Haffert, Jared R. Males, Laird M. Close, Olivier Guyon, Alexander Hedglen, Maggie Kautz
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Proceedings Volume 12185, Adaptive Optics Systems VIII; 121853D (2022) https://doi.org/10.1117/12.2630222
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
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Abstract
The Extremely Large Telescopes will require hundreds of actuators across the pupil for high Strehl in the visible. We envision a triple-stage AO (TSAO) system for GMT/GMagAO-X to achieve this. The first stage is a 4K DM controlled by an IR pyramid wavefront sensor that provides the first order correction. The second stage contains the high-order parallel DM of GMagAO-X that has 21000 actuators and contains an interferometric delay line for phasing of each mirror segment. This stage uses a Zernike wavefront sensor for high-order modes and a Holographic Dispersed Fringe Sensor for segment piston control. Finally, the third stage uses a dedicated 3K dm for non-common path aberration control and the coronagraphic wavefront control by using focal plane wavefront sensing and control. The triple stage architecture has been chosen to create simpler decoupled control loops. This work describes the performance of the proposed triple-stage AO architecture for ExAO with GMagAO-X.
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Sebastiaan Y. Haffert, Jared R. Males, Laird M. Close, Olivier Guyon, Alexander Hedglen, and Maggie Kautz "Visible extreme adaptive optics for GMagAO-X with the triple-stage AO architecture (TSAO)", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121853D (29 August 2022); https://doi.org/10.1117/12.2630222
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KEYWORDS
Wavefront sensors
Adaptive optics
Coronagraphy
Planets
Exoplanets
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