Temporal Spinwave Fabry-Perot Interferometry via Coherent Population Trapping
| Autor: | Fang, Ruihuan, Han, Chengyin, Jiang, Xunda, Qiu, Yuxiang, Guo, Yuanyuan, Zhao, Minhua, Huang, Jiahao, Lu, Bo, Lee, Chaohong |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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-P\'{e}rot interferometry via double-$\Lambda$ 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-$\Lambda$ system, the transmission spectrum is analytically explained by the Fabry-P\'{e}rot interferometry of temporal spinwaves. Due to small amplitude difference between the two Land\'{e} 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. Comment: 6 + 17 pages, 4 + 12 figures |
| Databáze: | arXiv |
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