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Excessive levitation for the efficient loading of large-volume optical dipole traps |
| Xiaoqing Wang(王晓青)1, Yuqing Li(李玉清)1,2, Guosheng Feng(冯国胜)1, Jizhou Wu(武寄洲)1, Jie Ma(马杰)1,2, Liantuan Xiao(肖连团)1,2, Suotang Jia(贾锁堂)1,2 |
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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Abstract We study the excessive levitation effect in the magnetically levitated loading process of ultracold Cs atoms into a large-volume crossed optical dipole trap. We analyze the motion of atoms with a non-zero combined gravito-magnetic force during the loading, where the magnetically levitated force catches up with and surpasses the gravity. We present the theoretical variations of both acceleration and velocity with levitation time and magnetic field gradient. We measure the evolution of the number of trapped atoms with the excessive levitation time at different magnetic field gradients. The dependence of the number of atoms on the magnetic field gradient is also measured for different excessive levitation times. The theoretical analysis shows reasonable agreement with the experimental results. Our investigation illustrates that the excessive levitation can be used to reduce the heating effect of atoms in the magnetically levitated loading process, and to improve the loading rate of a large-volume optical dipole trap.
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Received: 20 September 2017
Revised: 25 October 2017
Accepted manuscript online:
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PACS:
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87.80.Cc
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(Optical trapping)
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37.10.De
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(Atom cooling methods)
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37.10.Gh
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(Atom traps and guides)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT13076), the National Natural Science Foundation of China (Grant Nos. 91436108, 61378014, 61675121, 11434007, 61705123, and 61722507), the Fund for Shanxi "1331 Project" Key Subjects Construction and the Foundation for Outstanding Young Scholars of Shanxi Province, China (Grant No. 201601D021001), and the Applied Basic Research Project of Shanxi Province, China (Grant No. 201701D221002). |
Corresponding Authors:
Yuqing Li
E-mail: lyqing.2006@163.com
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Cite this article:
Xiaoqing Wang(王晓青), Yuqing Li(李玉清), Guosheng Feng(冯国胜), Jizhou Wu(武寄洲), Jie Ma(马杰), Liantuan Xiao(肖连团), Suotang Jia(贾锁堂) Excessive levitation for the efficient loading of large-volume optical dipole traps 2018 Chin. Phys. B 27 018702
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