中国物理B ›› 2015, Vol. 24 ›› Issue (8): 83701-083701.doi: 10.1088/1674-1056/24/8/083701

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Atomic motion in the magneto–optical trap consisting of partially spatially coherent laser

张宝武a b, 王兆英a, 孔德龙a, 林强a c   

  1. a Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China;
    b College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China;
    c Center for Optics and Optoelectronics Research, College of Science, Zhejiang University of Technology, Hangzhou 310023, China
  • 收稿日期:2015-01-21 修回日期:2015-04-30 出版日期:2015-08-05 发布日期:2015-08-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11174249 and 61475139), the National High-Technology Research and Development Program of China (Grant No. 2011AA060504), and the National Key Basic Research Program of China (Grant No. 2013CB329501).

Atomic motion in the magneto–optical trap consisting of partially spatially coherent laser

Zhang Bao-Wu (张宝武)a b, Wang Zhao-Ying (王兆英)a, Kong De-Long (孔德龙)a, Lin Qiang (林强)a c   

  1. a Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China;
    b College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China;
    c Center for Optics and Optoelectronics Research, College of Science, Zhejiang University of Technology, Hangzhou 310023, China
  • Received:2015-01-21 Revised:2015-04-30 Online:2015-08-05 Published:2015-08-05
  • Contact: Wang Zhao-Ying, Lin Qiang E-mail:zhaoyingwang@zju.edu.cn;qlin@zju.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11174249 and 61475139), the National High-Technology Research and Development Program of China (Grant No. 2011AA060504), and the National Key Basic Research Program of China (Grant No. 2013CB329501).

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摘要：

Rb atom motion in a magneto–optical trap (MOT) consisting of a partially spatially coherent laser (PSCL) is investigated theoretically. The spatial coherence of the laser is controlled by the electro–optic crystal. The instantaneous spatial distribution of the dissipative force induced by the PSCL on an Rb atom is varying with time stochastically. The simulated results indicate that compared with a fully coherent laser, the spatial coherent laser has effects on the atomic trajectories; however, the capture velocity and the escape velocity are kept the same. The main reason is that the spatial coherence of the laser fluctuates temporally and spatially, but the average photon scattering rate varies little, which makes the total number of atoms and the atomic density distribution unchanged.

关键词: MOT, the partially spatially coherent laser, Rb

Abstract:

Rb atom motion in a magneto–optical trap (MOT) consisting of a partially spatially coherent laser (PSCL) is investigated theoretically. The spatial coherence of the laser is controlled by the electro–optic crystal. The instantaneous spatial distribution of the dissipative force induced by the PSCL on an Rb atom is varying with time stochastically. The simulated results indicate that compared with a fully coherent laser, the spatial coherent laser has effects on the atomic trajectories; however, the capture velocity and the escape velocity are kept the same. The main reason is that the spatial coherence of the laser fluctuates temporally and spatially, but the average photon scattering rate varies little, which makes the total number of atoms and the atomic density distribution unchanged.

Key words: MOT, the partially spatially coherent laser, Rb

中图分类号:  (Atom cooling methods)

  • 37.10.De
42.25.Kb (Coherence) 42.50.Ct (Quantum description of interaction of light and matter; related experiments)