Improved atom number with a dual color magneto–optical trap

doi:10.1088/1674-1056/21/4/043203

中国物理B ›› 2012, Vol. 21 ›› Issue (4): 43203-043203.doi: 10.1088/1674-1056/21/4/043203

Improved atom number with a dual color magneto–optical trap

曹强¹,罗鑫宇¹,高奎意¹,王晓锐¹,陈东敏²,王如泉¹

收稿日期:2012-02-26 修回日期:2012-02-26 出版日期:2012-02-29 发布日期:2012-02-29
通讯作者: 王如泉, E-mail:ruquanwang@aphy.iphy.ac.cn E-mail:ruquanwang@aphy.iphy.ac.cn

Improved atom number with a dual color magneto–optical trap

Cao Qiang (曹强)^a,Luo Xin-Yu (罗鑫宇)^a,Gao Kui-Yi (高奎意)^a,Wang Xiao-Rui (王晓锐)^a,Chen Dong-Min (陈东敏)^b,Wang Ru-Quan (王如泉)^a

a. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China

Received:2012-02-26 Revised:2012-02-26 Online:2012-02-29 Published:2012-02-29
Contact: Wang Ru-Quan, E-mail:ruquanwang@aphy.iphy.ac.cn E-mail:ruquanwang@aphy.iphy.ac.cn
Supported by:
Project supported by the National High-Tech Research Program of China (Grant No. 2006AA06Z104), the National Basic Research Program of China (Grant No. 2006CB921206), and the National Natural Science Foundation of China (Grant No. 10704086)

摘要/Abstract

Abstract: We demonstrate a novel dual color magneto-optical trap (MOT), which uses two sets of overlapping laser beams to cool and trap ⁸⁷Rb atoms. The volume of cold cloud in the dual color MOT is strongly dependent on the frequency difference of the laser beams and can be significantly larger than that in the normal MOT with single frequency MOT beams. Our experiment shows that the dual color MOT has the same loading rate as the normal MOT, but much longer loading time, leading to threefold increase in the number of trapped atoms. This indicates that the larger number is caused by reduced light induced loss. The dual color MOT is very useful in experiments where both high vacuum level and large atom number are required, such as single chamber quantum memory and Bose-Einstein condensation (BEC) experiments. Compared to the popular dark spontaneous-force optical trap (dark SPOT) technique, our approach is technically simpler and more suitable to low power laser systems.

Key words: magneto-optical trap,

中图分类号: (Coherent control of atomic interactions with photons)

32.80.Qk

32.80.Xx (Level crossing and optical pumping)

曹强, 罗鑫宇, 高奎意, 王晓锐, 陈东敏, 王如泉.

Improved atom number with a dual color magneto–optical trap

[J]. 中国物理B, 2012, 21(4): 43203-043203.

Cao Qiang (曹强), Luo Xin-Yu (罗鑫宇), Gao Kui-Yi (高奎意), Wang Xiao-Rui (王晓锐), Chen Dong-Min (陈东敏), Wang Ru-Quan (王如泉). Improved atom number with a dual color magneto–optical trap[J]. Chin. Phys. B, 2012, 21(4): 43203-043203.

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Improved atom number with a dual color magneto–optical trap

Improved atom number with a dual color magneto–optical trap

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