采用Zeeman效应与饱和吸收法的激光器稳频

Frequency stabilized laser by Zeeman effect and saturated absorption lines of Rubidium atoms

由于塞曼效应中性原子的超精细能级在磁场中会产生塞曼分裂,且对于左旋和右旋圆偏振光原子能级的偏移不同,因此利用Zeeman效应的这种特性与饱和吸收相结合的方法对光栅外腔反馈的半导体激光器系统进行稳频。这种方法能够将激光频率稳定地锁在原子吸收谱线的峰值处,锁频后激光器不易失锁,用于激光冷却铷原子实验。

Because of Zeeman effect, Zeeman split takes place in the hyperfine level structure of neutral atoms where there is magnetic. And the split is different between the right circularly polarized light and the left circularly polarized light. An external cavity diode laser can be stabilized by Zeemam effect and saturated absorption lines of atoms. The method can stabilize the output frequency of laser on the peak of atoms absorption lines and less lose lock. The laser stabilized by this method is used in the experiment of laser cooling atoms.