Acousto-optical coherence tomography (AOCT) consists in using random phase
jumps on ultrasound and light to achieve a millimeter resolution when imaging
thick scattering media. We combined this technique with heterodyne off-axis
digital holography. Two-dimensional images of absorbing objects embedded in
scattering phantoms are obtained with a good signal-to-noise ratio. We study
the impact of the phase modulation characteristics on the amplitude of the
acousto-optic signal and on the contrast and apparent size of the absorbing
inclusion
