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The Magellan extreme adaptive optics (MagAO-X) instrument is a new extremeadaptive optics (ExAO) system designed for operation in the visible to near-IRwhich will deliver high contrast-imaging capabilities. The main AO system willbe driven by a pyramid wavefront sensor (PyWFS); however, to mitigate theimpact of quasi-static and non-common path (NCP) aberrations, focal planewavefront sensing (FPWFS) in the form of low-order wavefront sensing (LOWFS)and spatial linear dark field control (LDFC) will be employed behind a vectorapodizing phase plate (vAPP) coronagraph using rejected starlight at anintermediate focal plane. These techniques will allow for continuoushigh-contrast imaging performance at the raw contrast level delivered by thevAPP coronagraph 6 x 10^-5. We present simulation results for LOWFS and spatialLDFC with a vAPP coronagraph, as well as laboratory results for both algorithmsimplemented with a vAPP coronagraph at the University of Arizona ExtremeWavefront Control Lab.

Focal plane wavefront sensing and control strategies for high-contrast imaging on the MagAO-X instrument