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Chin. Phys. B, 2021, Vol. 30(6): 064211    DOI: 10.1088/1674-1056/abd76b

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)
College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
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.
Keywords:  resonance fluorescence      narrow spectral lines      microwave cavity  
Received:  23 November 2020      Revised:  19 December 2020      Accepted manuscript online:  30 December 2020
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 61875067 and 61178021).
Corresponding Authors:  Xiang-Ming Hu     E-mail:

Cite this article: 

Liang Hu(胡亮), Xiang-Ming Hu(胡响明), and Qing-Ping Hu(胡庆平) Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity 2021 Chin. Phys. B 30 064211

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