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从调制的基本概念出发，指出声光驻波调制器件为宽带频率调制型。讨论了调制度概念的成立条件和适用范围。理论上求出其成立条件为ｖ＜０．９（ｖ＝２πＬ△ｕ／λ为衍射光强Ｉ（θ，ｔ）中的自变量）。鉴于一般驻波型声光器件都是含有一定的行波成份，但行波声场和驻波声场在拉曼－奈斯衍射范围内衍射角均遵从ｓｉｎθｍｉ＝土ｍλ／，故两者在空间上是无法分开的。文中给出了从频域上测量调制度Ｍ的一种新方法。并给出了零级和一般衍射光的测量值。
Starting from the basic concept of modulation, it is pointed out that the acousto-optic standing wave modulation device is a broadband frequency modulation type. Discussed the concept of modulation degree of the conditions and scope of application. Theoretically, the condition for its establishment is v <0.9 (v = 2πLΔu / λ is the independent variable in the diffracted light intensity I (θ, t)). In view of the general standing wave acoustooptic devices contain a certain amount of traveling wave components, the diffraction angle of the traveling wave field and the standing wave sound field in the range of Raman-Ness diffraction are all in accordance with sinθmi = mλ /, so both of them are spatially Can not be separated. In this paper, a new method of measuring the modulation M from the frequency domain is given. The measured values of zero-order and general diffracted light are given.