中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64211-064211.doi: 10.1088/1674-1056/abd76b

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Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity

Liang Hu(胡亮), Xiang-Ming Hu(胡响明), and Qing-Ping Hu(胡庆平)   

  1. College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
  • 收稿日期:2020-11-23 修回日期:2020-12-19 接受日期:2020-12-30 出版日期:2021-05-18 发布日期:2021-06-05
  • 通讯作者: Xiang-Ming Hu E-mail:xmhu@mail.ccnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grants Nos. 61875067 and 61178021).

Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity

Liang Hu(胡亮), Xiang-Ming Hu(胡响明), and Qing-Ping Hu(胡庆平)   

  1. College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
  • Received:2020-11-23 Revised:2020-12-19 Accepted:2020-12-30 Online:2021-05-18 Published:2021-06-05
  • Contact: Xiang-Ming Hu E-mail:xmhu@mail.ccnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grants Nos. 61875067 and 61178021).

摘要: For a three-level atom, two nondegenerate (even microwave and optical) electric dipole transitions are usually allowed; for either of these, the fluorescence spectra are well-described in terms of spontaneous transitions from a triplet of dressed sublevels to an adjacent lower-lying triplet. When the three dressed sublevels are equally spaced from each other, a remarkable feature known as degenerate cascade fluorescence takes place, which displays a five-peaked structure. We show that a single cavity can make all the spectral lines extremely narrow, whether they arise from cavity-coupled or cavity-free transitions. This effect is based on intrinsic cascade lasing feedback and makes it possible to use a single microwave cavity (even a bad cavity) to narrow the spectral lines in the optical frequency regime.

关键词: resonance fluorescence, narrow spectral lines, microwave cavity

Abstract: For a three-level atom, two nondegenerate (even microwave and optical) electric dipole transitions are usually allowed; for either of these, the fluorescence spectra are well-described in terms of spontaneous transitions from a triplet of dressed sublevels to an adjacent lower-lying triplet. When the three dressed sublevels are equally spaced from each other, a remarkable feature known as degenerate cascade fluorescence takes place, which displays a five-peaked structure. We show that a single cavity can make all the spectral lines extremely narrow, whether they arise from cavity-coupled or cavity-free transitions. This effect is based on intrinsic cascade lasing feedback and makes it possible to use a single microwave cavity (even a bad cavity) to narrow the spectral lines in the optical frequency regime.

Key words: resonance fluorescence, narrow spectral lines, microwave cavity

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

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