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光外差－塞曼调制磁旋转光谱技术是一种高灵敏的吸收光谱技术。它同时对激光频率和样品的塞曼效应进行调制， 然后通过双解调来提取微弱的光谱信号。文内导出了该信号的数学表达式， 并对影响线型和灵敏度的多种物理参数进行了分析， 获得了与实验相符合的结果。
Optical heterodyne - Zeeman modulation Magnetic rotation spectroscopy is a highly sensitive absorption spectroscopy technique. It simultaneously modulates the laser frequency and the Zeeman effect of the sample and then extracts weak spectral signals by double-demodulation. The mathematical expression of the signal is derived in the text, and a variety of physical parameters that affect the linearity and sensitivity are analyzed, and the experimental results are obtained.