Abstract: Find dips in the centers of atomic lines when observing high-resolution optogalvanic spectra of Rb D₂ in hollow cathode lamp. The origin of these dips is analysed and studied. The frequency of a semiconductor laser(0.7800 μm) is locked to the center of a dip using this phenomenon.

Key words: optogalvanic spectrum, Rubidium atomic spectrum, Laser frequency stabilization

摘要： 应用空心阴极放电管观测铷D₂线的光电流谱，发现谱线中部有凹陷出现。对凹陷出现的原因进行了分析和研究。利用此现象，将半导体激光器(0.7800μm)频率锁定于谱线凹陷的中央。

关键词: 光电流谱, 铷原子光谱, 激光稳频