You searched for: “acousto optics
acousto-optic (s) (noun), acousto-optics (pl)
The science and technology of the interactions between sound waves and light waves passing through solid materials; especially, as applied to the modulation and deflection of laser beams by ultrasonic waves; important in laser and holographic technologies: "Samuel Waters was intent on perfecting a system of acousto-optics to enable him to expand his holographic business which printed passes for the local bus system."