中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4901-4905.doi: 10.1088/1674-1056/18/11/047

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Sub-natural linewidth of the probe absorption spectrum in a cold Cs atom molecule system

冯志芳1, 李卫东1, 肖连团2, 贾锁堂2   

  1. (1)Institute of Theoretical Physics, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China; (2)State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2009-01-19 修回日期:2009-02-27 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10444002, 10674087 and 10574084), 973 program (Grant Nos 2006CB921603 and 2008CB317103), SRF for ROCS, SEM, SRF for ROCS, Ministry of Personal of China and SRF for ROCS of Shanxi Province of China.

Sub-natural linewidth of the probe absorption spectrum in a cold Cs atom--molecule system

Feng Zhi-Fang(冯志芳)a), Li Wei-Dong(李卫东)a)†, Xiao Lian-Tuan(肖连团)b), and Jia Suo-Tang(贾锁堂)b)   

  1. a Institute of Theoretical Physics, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China; b State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China
  • Received:2009-01-19 Revised:2009-02-27 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10444002, 10674087 and 10574084), 973 program (Grant Nos 2006CB921603 and 2008CB317103), SRF for ROCS, SEM, SRF for ROCS, Ministry of Personal of China and SRF for ROCS of Shanxi Province of China.

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摘要： We theoretically analysed the linewidth of the probe absorption spectrum in a cold Cs atom--molecule system. The tunnelling coupling between the two excited molecular states, especially for the Cs atom--molecule system, plays an important role in obtaining the sub-natural linewidth of the probe absorption spectrum. For example, when the tunnelling couple strength fulfils \sigma _12=10γ _ab1, the linewidth is only about 0.66~MHz. Moreover, since the linewidth of interest is dominated by the tunnelling coupling, the absorption peak becomes very narrow even in the case of large pump laser intensities.

Abstract: We theoretically analysed the linewidth of the probe absorption spectrum in a cold Cs atom--molecule system. The tunnelling coupling between the two excited molecular states, especially for the Cs atom--molecule system, plays an important role in obtaining the sub-natural linewidth of the probe absorption spectrum. For example, when the tunnelling couple strength fulfils $\sigma_{12}=10\gamma_{ab_1}$, the linewidth is only about 0.66 MHz. Moreover, since the linewidth of interest is dominated by the tunnelling coupling, the absorption peak becomes very narrow even in the case of large pump laser intensities.

Key words: sub-natural linewidth, tunnelling coupling

中图分类号:  (Line shapes, widths, and shifts)

  • 32.70.Jz
33.70.Jg (Line and band widths, shapes, and shifts) 31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)