中国物理B ›› 2013, Vol. 22 ›› Issue (5): 56701-056701.doi: 10.1088/1674-1056/22/5/056701
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
段亚凡, 姜伯楠, 孙剑芳, 刘亢亢, 徐震, 王育竹
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)
摘要: 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.
中图分类号: (Bose-Einstein condensates in optical potentials)