  Imaging of a weak target hidden behind a scattering medium can be
significantly confounded by glare. We report a method, termed coherence gated
negation (CGN), that uses destructive optical interference to suppress glare
and allow improved imaging of a weak target. As a demonstration, we show that
by permuting through a set range of amplitude and phase values for a reference
beam interfering with the optical field from the glare and target reflection,
we can suppress glare by an order of magnitude, even when the optical wavefront
is highly disordered. This strategy significantly departs from conventional
coherence gating methods in that CGN actively 'gates out' the unwanted optical
contributions while conventional methods 'gate in' the target optical signal.
We further show that the CGN method can outperform conventional coherence
gating image quality in certain scenarios by more effectively rejecting
unwanted optical contributions.
