中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5272-5276.doi: 10.1088/1674-1056/18/12/026

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Lithium atom population transfer by population trapping in a chirped microwave pulse

贾光瑞, 张现周, 任振忠, 伍素玲   

  1. Department of Physics, Henan Normal University, Xinxiang 453007, China
  • 收稿日期:2008-12-03 修回日期:2009-04-03 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10774039).

Lithium atom population transfer by population trapping in a chirped microwave pulse

Jia Guang-Rui(贾光瑞)† , Zhang Xian-Zhou(张现周), Ren Zhen-Zhong(任振忠), and Wu Su-Ling(伍素玲)   

  1. Department of Physics, Henan Normal University, Xinxiang 453007, China
  • Received:2008-12-03 Revised:2009-04-03 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10774039).

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摘要： Using a time-dependent multilevel approach, we demonstrate that lithium atoms can be transferred to states of lower principle quantum number by exposing them to a frequency chirped microwave pulse. The population transfer from n = 79 to n = 70 states of lithium atoms with more than 80% efficiency is achieved by means of the sequential two-photon Δ n = - 1 transitions. It is shown that the coherent control of the population transfer can be accomplished by the optimization of the chirping parameters and microwave field strength. The calculation results agree well with the experimental ones and novel explanations have been given to understand the experimental results.

Abstract: Using a time-dependent multilevel approach, we demonstrate that lithium atoms can be transferred to states of lower principle quantum number by exposing them to a frequency chirped microwave pulse. The population transfer from n = 79 to n = 70 states of lithium atoms with more than 80% efficiency is achieved by means of the sequential two-photon $\varDelta n = - 1$ transitions. It is shown that the coherent control of the population transfer can be accomplished by the optimization of the chirping parameters and microwave field strength. The calculation results agree well with the experimental ones and novel explanations have been given to understand the experimental results.

Key words: time-dependent multilevel approach, two-photon transition, frequency chirped microwave pulse

中图分类号:  (Level crossing and optical pumping)

  • 32.80.Xx
32.80.Qk (Coherent control of atomic interactions with photons) 32.80.Wr (Other multiphoton processes) 42.50.-p (Quantum optics)