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Chin. Phys. B, 2017, Vol. 26(3): 033701    DOI: 10.1088/1674-1056/26/3/033701

Direct loading of atoms from a macroscopic quadrupole magnetic trap into a microchip trap

Jun Cheng(程俊)1,2, Jing-fang Zhang(张敬芳)1, Xin-ping Xu(许忻平)1, Hai-chao Zhang(张海潮)1, Yu-zhu Wang(王育竹)1
1 Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

We demonstrate the direct loading of cold atoms into a microchip 2-mm Z-trap, where the evaporative cooling can be performed efficiently, from a macroscopic quadrupole magnetic trap with a high loading efficiency. The macroscopic quadrupole magnetic trap potential is designed to be moveable by controlling the currents of the two pairs of anti-Helmholtz coils. The cold atoms are initially prepared in a standard six-beam magneto-optical trap and loaded into the macroscopic quadrupole magnetic trap, and then transported to the atom chip surface by moving the macroscopic trap potential. By means of a three-dimensional absorption imaging system, we are able to optimize the position alignment of the atom cloud in the macroscopic trap and the microchip Z-shaped wire. Consequently, with a proper magnetic transfer scheme, we load the cold atoms into the microchip Z-trap directly and efficiently. The loading efficiency is measured to be about 50%. This approach can be used to generate appropriate ultracold atoms sources, for example, for a magnetically guided atom interferometer based on atom chip.

Keywords:  atom chip      three-dimensional absorption imaging      direct magnetic loading     
Received:  23 June 2016      Published:  05 March 2017
PACS:  37.10.Gh (Atom traps and guides)  
  37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)  
  67.85.-d (Ultracold gases, trapped gases)  

Project supported by the National Natural Science Foundation of China (Grant No. 11604348).

Corresponding Authors:  Hai-chao Zhang, Yu-zhu Wang     E-mail:;

Cite this article: 

Jun Cheng(程俊), Jing-fang Zhang(张敬芳), Xin-ping Xu(许忻平), Hai-chao Zhang(张海潮), Yu-zhu Wang(王育竹) Direct loading of atoms from a macroscopic quadrupole magnetic trap into a microchip trap 2017 Chin. Phys. B 26 033701

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