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

• 作者: Liang Hu Xiang-Ming Hu Qing-Ping Hu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
• 页码范围: 393-406
• 页数: 14页
• 语种: 英文
• DOI: 10.1088/1674-1056/abd76b

摘要

For a three-level atom,two nondegenerate (even microwave and optical) electric dipole transitions are usually al-lowed;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.