  We present a photon noise and diffraction limited imaging method combining
the imaging laser and ultrasonic waves. The laser optical feedback imaging
(LOFI) technique is an ultrasensitive imaging method for imaging objects
through or embedded within a scattering medium. However, LOFI performances are
dramatically limited by parasitic optical feedback occurring in the
experimental setup. In this work, we have tagged the ballistic photons by an
acousto-optic effect in order to filter the parasitic feedback effect and to
reach the theoretical and ultimate sensitivity of the LOFI technique. We
present the principle and the experimental setup of the acousto-optic laser
optical feedback imaging (AO-LOFI) technique, and we demonstrate the
suppression of the parasitic feedback.
