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Chin. Phys. B, 2013, Vol. 22(5): 056701    DOI: 10.1088/1674-1056/22/5/056701
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Production of 87Rb Bose-Einstein condensates in a hybrid trap

Duan Ya-Fan, Jiang Bo-Nan, Sun Jian-Fang, Liu Kang-Kang, Xu Zhen, Wang Yu-Zhu
Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract  We report a rapid evaporative cooling method using a hybrid trap which is composed of a quadrupole magnetic trap and a one-beam optical dipole trap. It contains two kinds of evaporative coolings to reach the quantum degeneracy: previously radio-frequency (RF) enforced evaporative cooling in the quadrupole magnetic trap and further runaway evaporative cooling in the optical dipole trap. The hybrid trap does not require a very high power laser such as that in the traditional pure optical trap, but still has a deep trap depth and a large trap volume, and has better optical access than the normal magnetic trap like the quadrupole-Ioffe-configuration (QUIC) cloverleaf trap. A high trap frequency can be easily realized in the hybrid trap to enhance the elastic collision rate and shorten the evaporative cooling time. In our experiment, pure Bose-Einstein condensates (BECs) with about 1×10^5 atoms can be realized in 6 s evaporative cooling in the optical dipole trap.
Keywords:  ultra-cold atoms      Bose-Einstein condensates      optical dipole trap      hybrid trap     
Received:  08 October 2012      Published:  01 April 2013
PACS:  67.85.Hj (Bose-Einstein condensates in optical potentials)  
  37.10.Jk (Atoms in optical lattices)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974211), the National Basic Research Program of China (Grant No. 2011CB921504), and the Research Project of Shanghai Science and Technology Commission, China (Grant No. 09DJ1400700).
Corresponding Authors:  Wang Yu-Zhu     E-mail:  yzwang@mail.shcnc.ac.cn

Cite this article: 

Duan Ya-Fan, Jiang Bo-Nan, Sun Jian-Fang, Liu Kang-Kang, Xu Zhen, Wang Yu-Zhu Production of 87Rb Bose-Einstein condensates in a hybrid trap 2013 Chin. Phys. B 22 056701

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