中国物理B ›› 2011, Vol. 20 ›› Issue (7): 73701-073701.doi: 10.1088/1674-1056/20/7/073701

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation

何军, 杨保东, 张天才, 王军民   

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2010-12-08 修回日期:2011-02-22 出版日期:2011-07-15 发布日期:2011-07-15

Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation

He Jun(何军), Yang Bao-Dong(杨保东), Zhang Tian-Cai(张天才), and Wang Jun-Min(王军民)†   

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • Received:2010-12-08 Revised:2011-02-22 Online:2011-07-15 Published:2011-07-15

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摘要： By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap (MOT) as a function of the release time, the release-and-recapture (R&R) method is utilized to evaluate the effective temperature of the cold atomic ensemble. We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer. The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling (PGC) and the effective temperature is evaluated by extending the R&R technique to a single atom tweezer. The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase.

Abstract: By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap (MOT) as a function of the release time, the release-and-recapture (R&R) method is utilized to evaluate the effective temperature of the cold atomic ensemble. We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer. The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling (PGC) and the effective temperature is evaluated by extending the R&R technique to a single atom tweezer. The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase.

Key words: single atom, optical tweezer, effective temperature, release-and-recapture technique

中图分类号:  (Atom cooling methods)

  • 37.10.De
37.10.Gh (Atom traps and guides) 87.80.Cc (Optical trapping) 42.50.-p (Quantum optics)