本文描述利用4.3μm荧光饱和共振稳定CO_2激光器频率的基本原理和装置。测量了4.3μm荧光兰姆凹陷的宽度和深度,确定了其一阶、三阶微分信号与调制宽度、吸收室温度等参数的关系。拍频测量结果表明,其频率稳定度为2×10~(-10)(10s),复现性优于1×10~(-9)。 This article describes the basic principles and devices for stabilizing CO 2 laser frequencies using a 4.3 μm fluorescence saturated resonance. The width and depth of the 4.3 μm fluorescence Lambham depression were measured and the relationship between the first and third order differential signals and the modulation width, absorption chamber temperature and other parameters was determined. Beat frequency measurement results show that the frequency stability of 2 × 10 ~ (-10) (10s), reproducibility better than 1 × 10 ~ (-9).