| Constructive interference via collision—aided radiative excitation |
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| 引用本文： | 杨希华,孙真荣,丁良恩,王祖赓.Constructive interference via collision—aided radiative excitation[J].中国物理 B,2002,11(4):346-351. |
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| 作者姓名： | 杨希华 孙真荣 丁良恩 王祖赓 |
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| 作者单位： | Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China |
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| 基金项目： | 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.
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| 关 键 词： | 干涉 相长干涉 碰撞辐射激发 |
| 收稿时间： | 2001-05-20 |
Constructive interference via collision-aided radiative excitation |
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| Yang Xi-Hu,Sun Zhen-Rong,Ding Liang-En and Wang Zu-Geng.Constructive interference via collision-aided radiative excitation[J].Chinese Physics B,2002,11(4):346-351. |
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| Authors: | Yang Xi-Hu Sun Zhen-Rong Ding Liang-En and Wang Zu-Geng |
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| Institution: | Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China |
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| 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 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. |
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| Keywords: | constructive interference collision-aided radiative excitation hybrid excitation |
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