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高灵敏度谱分析技术是激光稳频系统的关键。通过系统的理论分析，结合国内外研究的稳频系统，详尽介绍了导数谱和ＦＭ 光谱激光稳频技术，并对其进行了分析、比较。两者的根本区别在于ＦＭ 光谱技术具有相对较大的调制频率，这是它们在应用中各具特点的根源：ＦＭ 光谱技术具有更高的灵敏度和噪声抑制能力，可以探测到０－００５ ％ 的微小吸收，而导数谱技术对未知的超精细谱线结构具有较好的兼容性。
High-sensitivity spectral analysis technology is the key to laser frequency stabilization system. Through the theoretical analysis of the system, combined with the frequency stabilization system studied at home and abroad, the derivative spectrum and the laser frequency stabilization technology of FM spectrum are introduced in detail, and analyzed and compared. The fundamental difference between the two is that FM spectroscopy has a relatively large modulation frequency, which is the root of their application in various characteristics: FM spectroscopy with higher sensitivity and noise suppression can detect 0-005% Tiny absorption, and derivative spectrum technology for the unknown hyperfine line structure has good compatibility.