采用永磁铁的钠原子二维磁光阱的设计和研究  

Design and research of two-dimensional magneto-optical trap of sodium atom using permanent magnets

作　　者：李子亮 师振莲 王鹏军[1,2] Li Zi-Liang;Shi Zhen-Lian;Wang Peng-Jun(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]极端光学协同创新中心,山西大学,太原030006

出　　处：《物理学报》2020年第12期96-103,共8页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2016YFA0301602);国家自然科学基金(批准号:11804203,11974224,11704234);三晋青年学者资助的课题。

摘　　要：在空间尺度上简化冷原子实验装置,有利于实验室空间的充分利用,特别有助于提高冷原子系统在航天、精密测量领域中的空间利用率.本文采用四组永磁铁产生的磁场构造了用于冷却俘获中性钠原子的二维磁光阱,并且利用磁铁组在竖直方向的剩磁分布实现了原子的塞曼冷却.钠原子在二维磁光阱中进一步冷却俘获,这为处于高真空的三维磁光阱提供了一个高效的原子束流.实验上通过优化塞曼冷却和二维磁光阱的参数,测得三维磁光阱中最大的原子装载率达2.3×10^9/s,实现了6.2×10^9个原子的俘获.这种采用永磁铁的二维磁光阱设计,结构简单紧凑,有助于提高实验室的空间利用率.此方案可以推广到冷却俘获其他中性原子.It is helpful to make full use of the laboratory space by simplifying the cold atom experimental system,especially in the area of aerospace and precision measurement.We present a two-dimensional magneto-optical trap(2 DMOT)for sodium atoms,whose magnetic field is produced by four sets of permanent magnets,and the residual field in the vertical direction is used for a Zeeman slower.The atoms are cooled and trapped in a2 DMOT which provides a highly efficient atomic flux for three-dimensional magneto-optical trap(3 DMOT)in a high-vacuum chamber.The maximum 3 DMOT loading rate is measured to be 2.3×10^9/s by optimizing the parameters of the Zeeman slower and the 2 DMOT.The atom number trapped in 3 DMOT is 6.2×10^9.The2 DMOT designed by using permanent magnets has the property of compact structure and simple size,which can be used to cool and trap other neutral atoms.

关 键 词：永磁体 激光冷却 二维磁光阱 

分 类 号：O431.2[机械工程—光学工程]