中国物理B ›› 2002, Vol. 11 ›› Issue (4): 346-351.doi: 10.1088/1009-1963/11/4/307

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Constructive interference via collision-aided radiative excitation

杨希华, 孙真荣, 丁良恩, 王祖赓   

  1. Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China
  • 收稿日期:2001-05-20 修回日期:2001-12-08 出版日期:2002-04-13 发布日期:2005-06-13
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 19734003 and 10074015).

Constructive interference via collision-aided radiative excitation

Yang Xi-Hua (杨希华), Sun Zhen-Rong (孙真荣), Ding Liang-En (丁良恩), Wang Zu-Geng (王祖赓)   

  1. Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China
  • Received:2001-05-20 Revised:2001-12-08 Online:2002-04-13 Published:2005-06-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 19734003 and 10074015).

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摘要： We have studied theoretically constructive interference via collision-aided radiative excitation in an open four-level system using a density matrix approach. The four-level system consists of a Λ-type three-level quantum-beat configuration driven by one laser field and a fourth level coupled by a vacuum mode. It is shown that through the incoherent process (collision), coherence between widely-separated doublets and subsequent constructive interference can be realized. We analyse the effects of the collision-induced coherent and incoherent decay rates, laser intensity, and energy separation of the doublets on the interference. Meanwhile, the constructive interference between the two transition pathways 3P1/2-4D and 3P3/2-4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na2-Na system is experimentally observed. A good agreement between the theoretical and experimental results is obtained.

Abstract: We have studied theoretically constructive interference via collision-aided radiative excitation in an open four-level system using a density matrix approach. The four-level system consists of a $\varLambda$-type three-level quantum-beat configuration driven by one laser field and a fourth level coupled by a vacuum mode. It is shown that through the incoherent process (collision), coherence between widely-separated doublets and subsequent constructive interference can be realized. We analyse the effects of the collision-induced coherent and incoherent decay rates, laser intensity, and energy separation of the doublets on the interference. Meanwhile, the constructive interference between the two transition pathways 3P1/2-4D and 3P3/2-4D via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na2-Na system is experimentally observed. A good agreement between the theoretical and experimental results is obtained.

Key words: constructive interference, collision-aided radiative excitation, hybrid excitation

中图分类号:  (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)

  • 42.50.Md
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.25.Kb (Coherence) 42.25.Hz (Interference) 32.80.Qk (Coherent control of atomic interactions with photons) 42.55.Ah (General laser theory)