Abstract: An electronic circuit is described which will allow an acoustoptic deflector to be used in multi-frequency mode at high power levels with a minimum amount of intermodulation between each frequency. Reduction of interference between multiple separate signal frequencies is achieved by precise control of the individual phasing of each separate frequency relative to a common reference frequency. The relative phase of each frequency is also controlled so that a low maximum power is achieved for the combined signal that is presented to the acousto-optic deflector without decreasing the overall average power of the multiple signal frequencies. The present invention is useful in systems such as optical data storage on tape or disk, optical printing and imaging, and acousto-optic signal or information processing.