Acousto-optic multifrequency modulation: linearization of the diffraction efficiencies

This is the authors' abstract. We don't add key points for this paper.

The global efficiency of multifrequency acousto-optic interaction is limited mainly by cross-modulation and multiple rediffraction effects. A study of the linearization of the N monochromatic light beams diffracted by N acoustic carriers is reported. It has been found that the introduction of another acoustic carrier allows the global acousto-optic efficiency to remain at the same level. The authors show that a suitable anisotropic interaction can greatly reduce the multiple rediffraction effects. The experimental results presented for a bifrequency paratellurite acousto-optic modulator, with a global efficiency up to 80%, agree well with the theoretical ones.