量子电子学报

• 量子光学 • 上一篇    下一篇

利用解压缩磁光阱技术实现铷87原子的亚多普勒冷却

张东方1,2,3, 高天佑1,2,3 , 孔令冉1,2,3, 李 凯1, 江开军1,2   

  1. 1中国科学院武汉物理与数学研究所,波谱与原子分子物理国家重点实验室,湖北 武汉 430071; 2中国科学院武汉物理与数学研究所,中国科学院冷原子物理中心,湖北 武汉 430071; 3中国科学院大学,北京 100049
  • 发布日期:2019-06-11
  • 通讯作者: 江开军(1975- ),湖北人,博士,研究员,主要从事超冷玻色费米混合气体方面的研究。 E-mail:kjjiang@wipm.ac.cn
  • 作者简介:张东方(1988- ),山东人,博士生,主要从事超冷玻色费米混合气体方面的研究。E-mail:zdf0116@wipm.ac.cn
  • 基金资助:
    Supported by National Natural Science Foundation of China(国家自然科学基金, 91336106)

Sub-Doppler cooling 87Rb atoms using decompressed magneto-optical trap

ZHANG Dongfang1,2,3, GAO Tianyou1,2,3, KONG Lingran1,2,3, LI Kai1, JIANG Kaijun1,2   

  1. 1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; 2 Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; 3 University of the Chinese Academy of Sciences, Beijing 100049, China
  • Online:2019-06-11

摘要: 利用解压缩磁光阱(DCMOT)技术将铷87原子温度降低到多普勒冷却极限温度以下。在磁光阱中获得铷87原子冷原子团,通过减小磁场梯度、降低回泵光功率和增加冷却光失谐量进一步降低冷原子温度。通过研究原子自由飞行后密度随磁场梯度、回泵光功率和冷却光失谐量的变化关系,得到最优化的实验参数。利用DCMOT测得原子的温度为129 ,低于铷87原子的多普勒冷却极限温度(144 )。将低温冷原子直接装载到磁阱中,装载效率为25%。

关键词: 磁光阱, 多普勒冷却极限, 解压缩磁光阱, 压缩磁光阱, 偏振梯度冷却

Abstract: 87Rb atoms can be cooled below the Doppler cooling limit by using the decompressed magneto-optical trap (DCMOT) technique. Cold rubidium atoms are trapped in magneto-optical trap (MOT), and the temperature of cold atoms is further lowered by decreasing the magnetic field gradient and repumping light power, increasing the detuning of cooling light. The optimal experimental parameters are obtained by investigating the relationship between atomic density after free flight with the magnetic field gradient, power of repumping light and detuning of cooling light. etween atomic density of time-of-flight (TOF) and each one of the three parameters. The atom temperature is 129 measured with DCMOT, which is lower than Doppler cooling limit temperature of Rubidium 87 atom (144 ). The cold atoms are loaded directly into the magnetic trap with a loading efficiency of 25%.

Key words: magneto-optical trap, Doppler cooling limit, decompressed magneto-optical trap, compressed magneto-optical trap, polarization gradient cooling