设计了一种应用于光抽运铯原子钟的稳频激光器, 用小型化的饱和吸收装置对激光进行稳频, 用于产生饱和吸收谱的泵浦光的偏振方向与检测光的偏振方向相互垂直, 通过调节激光的偏振方向增大铯原子的跃迁几率.相对于一般简化的饱和吸收装置, 小型化的饱和吸收装置产生的用于锁频的参考信号的幅度更大.当激光频率被锁定在铯原子的6S1/2, F=4→6P3/2, F=5能级跃迁线上时, 对激光器的稳定度进行了测量, 百秒稳定度为1.88×10－11.该稳频激光器的体积较小, 有利于光抽运铯原子钟的小型化和工程化应用.

A frequency stabilized laser used in optically pumped cesium beam clocks is designed. The concise saturated absorption frequency stabilization system, in which the polarization direction of pumping laser is perpendicular to the polarization direction of probing laser, is utilized to lock laser frequency. The transition probability of the cesium atom is improved by the adjustment of the polarization direction of pumping laser. The amplitude of reference signal produced by the proposed system is higher than the signal produced by the simplified saturated absorption frequency stabilization system. When laser is locked at the frequency of the cycling transition 6S1/2, F=4→6P3/2, F=5 of cesium, the frequency stability is measured as 1.88×10－11 at 100 s. The setup of the system is compact, which is beneficial to the miniaturization and engineering of the optically pumped cesium beam clocks.