多频声光互作用的研究

A study of multifrequency acoustooptic interaction

本文推导出包括正常和反常声光互作用在内的多频声光耦合波方程的普适形式,并得出两个独立超声波信号时布拉格状态下方程的解.分析了多频声光互作用的各种线性和非线性效应,包括衍射效率、压缩、交叉调制和各级互调制强度等,并指出反常与正常多频声光衍射的差异.结论是反常多频声光互作用情况下,各级互调制模强度与主衍射模强度的比值小于正常多频声光互作用情况下的相应比值.实验结果与理论分析相符.

The multifrequenoy acoustooptio coupled mode equations, including mormal and abnormal aooustooptio interactions, are presented in this paper. The solutions of the equations for two independent acoustic signals in the Bragg limit are derious linear and nonlinear effects of the multifrequency acoustooptio interactions are analysed theretically. These include diffraction efficiency, compression, cross modulation, and additional intermodulation intensities. Specially the differences between the abnormal diffraction and the normal diffraction are pointed out and analyse. The experimental results are in good agreement with theoretical analyses.