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

doi:10.1088/1674-1056/22/5/056701

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
Revised: 28 November 2012
Accepted manuscript online:

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 (段亚凡), Jiang Bo-Nan (姜伯楠), Sun Jian-Fang (孙剑芳), Liu Kang-Kang (刘亢亢), Xu Zhen (徐震), Wang Yu-Zhu (王育竹) Production of ⁸⁷Rb Bose-Einstein condensates in a hybrid trap 2013 Chin. Phys. B 22 056701

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

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