介绍了在准二维磁光阱(2D+-MOT)中获得超冷原子的实验装置及结果。利用四个矩形线圈、四束椭圆形光斑光束加两束圆形光斑激光束,得到准二维磁光阱,它的特点是势阱为长条形,轴向束缚较小,势阱整体体积比较大,因而可以俘获到数目较多的超冷原子。实验中心附近的磁场梯度为1.3×10-3 T/cm,椭圆型光斑的长/短轴为24 mm/7 mm,圆形光斑直径为7 mm,光斑功率分别为18 mW,6 mW。在该势阱中俘获长条形冷原子团的长度为12 mm,直径为1.5 mm,原子数为1.1×107,温度为400 μK。

The setup and the experiment of a quasi-two dimension magnetic-optical-trap (MOT) are introduced in the paper. Four rectangular coils combining four elliptical spot beams and two orbicular spot beams are used to obtain a MOT and trap cold atoms. The characteristic of the trap is a pole shape and a bulk trap capacity, so the trap can capture more atoms, atomic cloud. The data of experiment are as following