Characteristics of light diffraction by two acoustic waves, one of which has a complex frequency structure

A theoretical study is made of light diffraction by two orthogonal acoustic waves, one of which is excited in an elastic medium by an AM signal with a complex frequency structure. It is shown that the energy of the incident light wave is distributed between two scattered components, the intensity of one of these components being proportional to the square of the complex-signal envelope. A method is developed for calculating the diffraction wave-parameter Q and the length of acoustooptic interaction. It is concluded that light diffraction by two orthogonal acoustic waves can be utilized not only for two-dimensional light scanning in two-coordinate acoustooptic deflectors but also for the processing of complex radio signals.