Temporal Spinwave Fabry-Perot Interferometry via Coherent Population Trapping
Abstract
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- CPT of laser-cooled 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- 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.
Cite
@article{arxiv.2008.12562,
title = {Temporal Spinwave Fabry-Perot Interferometry via Coherent Population Trapping},
author = {Ruihuan Fang and Chengyin Han and Xunda Jiang and Yuxiang Qiu and Yuanyuan Guo and Minhua Zhao and Jiahao Huang and Bo Lu and Chaohong Lee},
journal= {arXiv preprint arXiv:2008.12562},
year = {2021}
}
Comments
6 + 17 pages, 4 + 12 figures