报道以微型半导体抽运Nd:YVO4全固体激光器为光源, 通过射频位相调制和光外差光谱检测技术, 获得碘分子在532 nm波段无Doppler饱和吸收光谱, 并将激光频率锁定在碘分子超精细结构光谱线上. 根据锁定误差讯号分析, 证明采用光外差调频技术, 该激光器频率稳定性可优于10-12(1 s积分时间). It reports that Nd: YVO4 all-solid-state laser pumped by micro-semiconductor is used as the light source. By radio frequency phase modulation and optical heterodyne spectroscopy, no Doppler saturated absorption spectra of iodine molecules are obtained at 532 nm, and the laser frequency is locked in the ultrafine structure of iodine Spectral line.According to the locking error signal analysis, it is proved that the frequency stability of the laser can be better than 10-12 (1 s integration time) by adopting the optical heterodyne frequency modulation technology.