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

作     者：Liang Hu Xiang-Ming Hu Qing-Ping Hu 胡亮;胡响明;胡庆平

作者机构：College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第6期

页      面：346-358页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grants Nos. 61875067 and 61178021) 

主　　题：resonance fluorescence narrow spectral lines microwave cavity 

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.