以慢原子束方式进行原子转移的双磁光阱系统

建立了一套用于玻色．爱因斯坦凝聚实验的铷原子双磁光阱装置．从低速强源中获得慢原子柬，向超高真空磁光阱进行原子转移．低速强源磁光阱与超高真空磁光阱之间可维持3个量级的压强差，超高真空磁光阱的真空度最高可达1×10^-9Pa．慢原子束的束流通量达1×10^9／s．约4×10^8个^17Rb原子被装载到超高真空磁光阱中．还讨论了两种典型情况下磁光阱中装载的最大原子数．

A rubidium double magneto-optical trap(MOT) system for Bose-Einstein condensation experiments has been set up. A slow atomic beam has been obtained with a low-velocity intense source (LVIS) and used to transfer atoms into an ultra-high-vacuum (UHV) MOT. By maintaining a pressure difference of 3 orders between LVIS-MOT and UHV-MOT, a lowest pressure of 1 x 10(-9)Pa can be achieved in UHV-MOT. The flux of the slow atomic beam is 1 x 10(9)/s. About 4 x 10(887)Rb atoms can be loaded into UHV-MOT. In this paper, maximum number of atoms captured in MOTs under two typical conditions have also been discussed.