声光相互作用产生频移和拍频的理论已经较为完善,但没有具体变化规律的描述。从实验出发,利用高频探测器结合共焦扫描干涉仪和频谱分析仪,用实验方法通过研究Raman-Nath衍射点的拍频现象直观地将声光相互作用产生拍频的现象展示出来,对拍频的产生机理进行了相关分析,并总结了拍频形成的规律,对其产生的条件等因素做了探索。%The theories of frequency shift and beat frequency generated by acousto-optic interaction are more perfect, but the detailed changing rules are not described. Based on experiments and with a high frequency detector, a confocal scanning interferometer and a spectrum analyzer, through researching the beat frequency phenomena of Raman-Nath diffraction point, the beat frequency phenomena generated by acousto-optic interaction is directly shown. The generation principle of beat frequency is analyzed. The generation rule of beat frequency is summarized.
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