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Imaging planets in reflected light, a key focus of future NASA missions andELTs, requires advanced wavefront control to maintain a deep, temporallycorrelated null of stellar halo -- i.e. a dark hole -- at just severaldiffraction beam widths. Using the Ames Coronagraph Experiment testbed, wepresent the first laboratory tests of Spatial Linear Dark Field Control (LDFC)approaching raw contrasts ($\sim$ 5$\times$10$^{-7}$) and separations (1.5--5.2$\lambda$/D) needed to image jovian planets around Sun-like stars withspace-borne coronagraphs like WFIRST-CGI and image exo-Earths around low-massstars with future ground-based 30m class telescopes. In four separateexperiments and for a range of different perturbations, LDFC largely restores(to within a factor of 1.2--1.7) and maintains a dark hole whose contrast isdegraded by phase errors by an order of magnitude. Our implementation ofclassical speckle nulling requires a factor of 2--5 more iterations and 20--50DM commands to reach contrasts obtained by spatial LDFC. Our results provide apromising path forward to maintaining dark holes without relying on DM probingand in the low-flux regime, which may improve the duty cycle of high-contrastimaging instruments, increase the temporal correlation of speckles, and thusenhance our ability to image true solar system analogues in the next twodecades.

Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light