  We present high resolution adaptive optics (AO) corrected images of the
silhouette disk Orion 218-354 taken with Magellan AO (MagAO) and its visible
light camera, VisAO, in simultaneous differential imaging (SDI) mode at
H-alpha. This is the first image of a circumstellar disk seen in silhouette
with adaptive optics and is among the first visible light adaptive optics
results in the literature. We derive the disk extent, geometry, intensity and
extinction profiles and find, in contrast with previous work, that the disk is
likely optically-thin at H-alpha. Our data provide an estimate of the column
density in primitive, ISM-like grains as a function of radius in the disk. We
estimate that only ~10% of the total sub-mm derived disk mass lies in
primitive, unprocessed grains. We use our data, Monte Carlo radiative transfer
modeling and previous results from the literature to make the first
self-consistent multiwavelength model of Orion 218-354. We find that we are
able to reproduce the 1-1000micron SED with a ~2-540AU disk of the size,
geometry, small vs. large grain proportion and radial mass profile indicated by
our data. This inner radius is a factor of ~15 larger than the sublimation
radius of the disk, suggesting that it is likely cleared in the very interior.
