  Exoplanet imaging has thus far enabled studies of wide-orbit ($>$10 AU) giant
planet ($>$2 Jupiter masses) formation and giant planet atmospheres, with
future 30 meter-class Extremely Large Telescopes (ELTs) needed to image and
characterize terrestrial exoplanets. However, current state-of-the-art
exoplanet imaging technologies placed on ELTs would still miss the contrast
required for imaging Earth-mass habitable-zone exoplanets around low-mass stars
by ~100x due to speckle noise--scattered starlight in the science image due to
a combination of aberrations from the atmosphere after an adaptive optics (AO)
correction and internal to the telescope and instrument. We have been
developing a focal plane wavefront sensing technology called the Fast
Atmospheric Self-coherent camera Technique (FAST) to address both of these
issues; in this work we present the first results of simultaneous first and
second stage AO wavefront sensing and control with a Shack Hartmann wavefront
sensor (SHWFS) and FAST, respectively, using two common path deformable
mirrors. We demonstrate this "multi-WFS single conjugate AO" real-time control
at up to 200 Hz loop speeds on the Santa Cruz Extreme AO Laboratory (SEAL)
testbed, showing a promising potential for both FAST and similar high-speed
diffraction-limited second-stage wavefront sensing technologies to be deployed
on current and future observatories, helping to remove speckle noise as the
main limitation to ELT habitable exoplanet imaging.
