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Ground-based high contrast imaging (HCI) and extreme adaptive optics (AO)technologies have advanced to the point of enabling direct detections ofgas-giant exoplanets orbiting beyond the snow lines around nearby young starsystems. However, leftover wavefront errors using current HCI and AOtechnologies, realized as "speckles" in the coronagraphic science image, stilllimit HCI instrument sensitivities to detecting and characterizing lower-mass,closer-in, and/or older/colder exoplanetary systems. Improving the performanceof AO wavefront sensors (WFSs) and control techniques is critical to improvingsuch HCI instrument sensitivity. Here we present three different ongoingwavefront sensing and control project developments on the Santa cruz Extreme AOLaboratory (SEAL) testbed: (1) "multi-WFS single congugate AO (SCAO)" using theFast Atmospheric Self-coherent camera (SCC) Technique (FAST) and a ShackHartmann WFS, (2) pupil chopping for focal plane wavefront sensing, first withan external amplitude modulator and then with the DM as a phase-only modulator,and (3) a laboratory demonstration of enhanced linearity with the non-modulatedbright Pyramid WFS (PWFS) compared to the regular PWFS. All three topics sharea common theme of multi-WFS SCAO and/or second stage AO, presentingopportunities and applications to further investigate these techniques in thefuture.

Various Wavefront Sensing and Control Developments on the Santa Cruz Extreme AO Laboratory (SEAL) Testbed