要实现分子激光冷却，一般需要多束频率稳定的窄线宽激光。提出采用Pound-Drever-Hall(PDH)技术将冷却激光通过光学传递腔的方法锁定到铷原子饱和吸收稳频的半导体激光上，从而实现冷却激光线宽压窄和频率长时稳定的实验方案。设计并制作了法布里-珀罗(F-P)光学腔，建立了光学稳频系统，实现了光学腔到参考光源的锁定。

The experiment of laser cooling of molecules generally needs multiple lasers with narrow linewidth and passive-stabilized frequency. We propose to use Pound-Drever-Hall (PDH) technique to lock the cooling laser onto the diode laser stabilized by the saturated absorption spectroscopy of Rb atom through the transfer optical cavity. The linewidth and long term drift of the cooling laser frequency could be controlled. The Fabry-Parot (F-P) optical cavity is designed and made, and the optical stabilization system is set up, and the optical transfer cavity is locked onto the reference laser through PDH technique.