利用塞曼减速法实现锶同位素的磁光阱俘获

Trapping Four Isotopes of Strontium in a MOT by Using Zeeman Slowing

利用塞曼减速法在磁光阱(MOT)中实现锶原子一级冷却,使用塞曼减速器对进入阱区前的热原子束进行减速,实验时该减速器线圈通入10.2 A电流,阱区反亥姆霍兹线圈通入10 A电流时,中心区域线性磁场梯度为4 mT/cm,用于冷却和俘获的激光波长为461 nm,其对应于锶原子(5s^2)~1S_0→(5s5p)~1P_1的能级跃迁。通过实验获得了锶4种同位素的冷原子团、探测到相应的冷原子荧光光谱,并且测定其中^(88)Sr,^(87)Sr和^(86)Sr的冷原子数目分别为1.759×10~6,1.759×10~5和2.638×10~5。

Optical clock is reported that the capture of cold strontium（Sr） atoms in a magneto-optical trap（MOT） by using Zeeman slowing.The MOT is loaded from a thermal atomic beam which is decelerated by a Zeeman slower having 10.2 A electric current.The anti-Helmholtz coils of MOT have 10 A current and then can induce a linear magnetic field.Its gradient is 4 mT/cm in the central zone.The 461 nm laser is used for Zeeman slowing and trapping which corresponds to the transition of Sr atomic level（5s^2）~1S_0→（5s5p）~1P_1.According to the experiment, four isotopes of Sr in MOT are obtained and the fluorescent spectrums of the atoms are detected.Using the fluorescence,the number of three isotopes ^（88）Sr,^（87）Sr,^（86）Sr is measured,which is 1.759×10~6,1.759×10~5 and 2.638×10~5 separately.