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The Extremely Large Telescopes will require hundreds of actuators across thepupil 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 controlledby an IR pyramid wavefront sensor that provides the first order correction. Thesecond stage contains the high-order parallel DM of GMagAO-X that has 21000actuators and contains an interferometric delay line for phasing of each mirrorsegment. This stage uses a Zernike wavefront sensor for high-order modes and aHolographic Dispersed Fringe Sensor for segment piston control. Finally, thethird stage uses a dedicated 3K dm for non-common path aberration control andthe coronagraphic wavefront control by using focal plane wavefront sensing andcontrol. The triple stage architecture has been chosen to create simplerdecoupled control loops. This work describes the performance of the proposedtriple-stage AO architecture for ExAO with GMagAO-X.

Visible extreme adaptive optics for GMagAO-X with the triple-stage AO architecture (TSAO)