Magnetic levitation for effective loading of cold cesium atoms in a crossed dipole trap

Yuqing Li, Guosheng Feng, Rundong Xu, Xiaofeng Wang, Jizhou Wu, Gang Chen, Xingcan Dai, Jie Ma, Liantuan Xiao, and Suotang Jia
Phys. Rev. A 91, 053604 – Published 6 May 2015

Abstract

We report a detailed study of effective magnetically levitated loading of cold atoms in a crossed dipole trap: an appropriate magnetic field gradient precisely compensates for the destructive gravitational force of the atoms and an additional bias field simultaneously eliminates the antitrapping potential induced by the magnetic field gradient. The magnetic levitation is required for a large-volume crossed dipole trap to form a shallow but very effective loading potential, making it a promising method for loading and trapping more cold atoms. For cold cesium atoms in the F=3, mF=3 state prepared by three-dimensional degenerated Raman sideband cooling, a large number of atoms 3.2×106 have been loaded into a large-volume crossed dipole trap with the help of the magnetic levitation technique. The dependence of the number of atoms loaded and trapped in the dipole trap on the magnetic field gradient and bias field, respectively, is in good agreement with the theoretical analysis. The optimum magnetic field gradient of 31.13 G/cm matches the theoretical value of 31.3 G/cm well. This method can be used to obtain more cold atoms or a large number of Bose-Einstein condensation atoms for many atomic species in high-field seeking states.

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  • Received 28 January 2015

DOI:https://doi.org/10.1103/PhysRevA.91.053604

©2015 American Physical Society

Authors & Affiliations

Yuqing Li1, Guosheng Feng1, Rundong Xu1, Xiaofeng Wang1, Jizhou Wu1, Gang Chen1, Xingcan Dai2, Jie Ma1,*, Liantuan Xiao1, and Suotang Jia1

  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China
  • 2State Key Laboratory for Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China

  • *mj@sxu.edu.cn

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Vol. 91, Iss. 5 — May 2015

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