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叙述光抽运铯原子束频率标准的工作原理和实施技术。着重描述了北京大学的实验频标的设计方案与工作特色：主要是保证这类频标长期连续工作的半导体激光器的频率锁定技术以及特别采用了斜光检测的方法，从而提高了频标性能。北京大学的频标能连续稳定工作两个月以上，首次在国际上获得了长期稳定度的数据，无稳定度达２×１０－１３。
Describes the working principle and implementation technology of optical pumping Cesium atomic beam frequency standard. This paper mainly describes the design scheme and working characteristic of Peking University experimental frequency standard. It mainly aims to improve the performance of frequency standard mainly by ensuring the frequency locking technology of semiconductor laser with long-term continuous working of such frequency standard and adopting the special method of oblique light detection. The frequency standard of Peking University can work continuously and steadily for more than two months. For the first time, the long-term stability data have been obtained in the world, with no stability of 2 × 10-13.