arXiv 2008.125622020-08quant-phcond-mat.quant-gasphysics.atom-ph

相干布居俘获的时间自旋波法布里-珀罗干涉术

Temporal Spinwave Fabry-Perot Interferometry via Coherent Population Trapping

Ruihuan Fang, Chengyin Han, Xunda Jiang, Yuxiang Qiu, Yuanyuan Guo, Minhua Zhao, Jiahao Huang, Bo Lu, Chaohong Lee

备注：: 6 + 17 pages, 4 + 12 figures

摘要：

通过相干布居捕获（CPT）的拉姆齐光谱在精确测量中是必不可少的。传统的CPT-Ramsey条纹包含许多几乎相同的振荡，因此很难识别中心条纹。在这里，我们通过激光冷却的$^{87}$ Rb原子的双$Λ$ CPT实验演示了时间自旋波Fabry-Pérot干涉。由于时间自旋波的相长干涉，透射谱在频域中呈现为等间距的梳状峰，因此可以容易地识别中心Ramsey条纹。从五能级双$Λ$系统的光学Bloch方程出发，用时间自旋波的Fabry-Pérot干涉术解析地解释了透射谱。当外加磁场不太弱时，由于两个Landé因子之间的幅度差很小，每个峰分裂为两个。这种峰分裂可以用来测量未知的磁场，而不涉及磁敏跃迁。

英文摘要：

Ramsey spectroscopy via coherent population trapping (CPT) is essential in precision measurements. The conventional CPT-Ramsey fringes contain numbers of almost identical oscillations and so that it is difficult to identify the central fringe. Here, we experimentally demonstrate a temporal spinwave Fabry-Pérot interferometry via double-$Λ$ CPT of laser-cooled $^{87}$Rb atoms. Due to the constructive interference of temporal spinwaves, the transmission spectrum appears as a comb of equidistant peaks in frequency domain and thus the central Ramsey fringe can be easily identified. From the optical Bloch equations for our five-level double-$Λ$ system, the transmission spectrum is analytically explained by the Fabry-Pérot interferometry of temporal spinwaves. Due to small amplitude difference between the two Landé factors, each peak splits into two when the external magnetic field is not too weak. This peak splitting can be employed to measure an unknown magnetic field without involving magneto-sensitive transitions.

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英文摘要：

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