利用Doppler测速法实现小发散角锶原子速度分布的测量

Measurement of Velocity Distribution of Strontium Atoms with Small Divergence Angle by Doppler Anemometry

锶光钟小型化系统中,利用Doppler测速法对小发散角锶原子的速度分布进行了测量。从锶炉喷出原子束的最可几速率为440 m/s,经过永磁体塞曼减速器减速后原子的速度最低可降低至80 m/s。验证了在原子行进过程中设置的减速磁场即永磁体塞曼减速器,能够对原子进行有效减速,进而提高俘获冷原子的数目。实验中采用的Doppler测速法装置简单,易于操作,可直接探测原子束的速度分布曲线。

Velocity distribution of Strontium atoms with small divergence angle was measured using Doppler anemometry in optical clock miniaturized systems.The most probable velocity of atoms oven was 440m/s,which was lowest reduced to 80m/s through the Zeeman slower based on permanent magnets.It showed that velocity of atoms could be effectively slowed down by a Zeeman slower,which was set before atoms being into magneto-optical trap（MOT）in physical system.The lower velocity of atoms was,the more atoms we could get.The apparatus used in the experiment was simple and easy to be operated.And the velocity distribution was directly detected by Doppler anemometry.