采用高频声光器件，利用声光频移效应产生150MHz的拍频波，移动反光镜，用示波器测量近程光与远程光的相位差求得拍频波的波长，进而测得光的传播速度，即“光拍法”。
指出在这种简并四波混频中同样可能存在量子拍频效应。
It is shown that quantum beat effect exists in the time-resolved degenerate four-wave mixing.
分析了这种量子拍频效应的产生条件和特点。讨论了可能的应用。
The behavior of the quantum beat are analysed and its possible applications are discussed.
本文采用二阶相干函数理论研究了级联三能级系统中三阶及五阶极化拍频(TPBCTS及FPBCTS)的非线性效应。
Based on the second-order coherence function theory, authors have studied nonlinear effects of third-and fifth-order on polarization beats in a cascade three-level system (TPBCTS and FPBCTS).
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