A study of normal and abnormal multifrequency acousto-optic device

The general format of multifrequency acousto-optic coupled wave equation including normal and abnormal acousto-optic interaction is presented in this paper. The solutions of the equations for two independent ultrasonic wave signals in the Bragg limit are put forward. These include diffraction efficiency, compression, cross modulation and additional intermodulation intensities. Especially the differences between the abnormal and normal diffraction are pointed out and analysed. The experimental results are in good agreement with theoretical analyses.