| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Nonlinear spectroscopy of three-photon excitation of cesium Rydberg atoms in vapor cell |
| Jiabei Fan(樊佳蓓)1, Yunhui He(何云辉)1, Yuechun Jiao(焦月春)1,2, Liping Hao(郝丽萍)1, Jianming Zhao(赵建明)1,2,†, and Suotang Jia(贾锁堂)1,2 |
| 1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China; 2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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Abstract We present nonlinear spectra of four-level ladder cesium atoms employing 6S1/2 $\rightarrow$ 6P3/2$\rightarrow$ 7S1/2 $\rightarrow$ 30P3/2 scheme of a room temperature vapor cell. A coupling laser drives Rydberg transition, a dressing laser couples two intermediate levels, and a probe laser optically probes the nonlinear spectra via electromagnetically induced transparency (EIT). Nonlinear spectra are detected as a function of coupling laser frequency. The observed spectra exhibit an enhanced absorption (EA) signal at coupling laser resonance to Rydberg transition and enhanced transmission (ET) signals at detunings to the transition. We define the enhanced absorption (transmission) strength, H EA (H ET), and distance between two ET peaks, γ ET, to describe the spectral feature of the four-level atoms. The enhanced absorption signal H EA is found to have a maximum value when we vary the dressing laser Rabi frequency $\varOmega_\rm d$, corresponding Rabi frequency is defined as a separatrix point, $\varOmega_\rm d_\rm Se$. The values of $\varOmega_\rm d_\rm Se$ and further $\eta=\varOmega_\rm d_\rm Se/\varOmega_\rm c$ are found to depend on the probe and coupling Rabi frequency but not the atomic density. Based on $\varOmega_\rm d_\rm Se$, the spectra can be separated into two regimes, weak and strong dressing ranges, $\varOmega_\rm d$ $\lesssim$ $\varOmega_\rm d_\rm Se$ and $\varOmega_\rm d$ $\gtrsim$ $\varOmega_\rm d_\rm Se$, respectively. The spectroscopies display different features at these two regimes. A four-level theoretical model is developed that agrees well with the experimental results in terms of the probe-beam absorption behavior of Rabi frequency-dependent dressed states.
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Received: 30 July 2020
Revised: 13 October 2020
Accepted manuscript online: 13 November 2020
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PACS:
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42.65.An
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(Optical susceptibility, hyperpolarizability)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the State Key Program of the National Natural Science of China (Grant Nos. 11434007 and 61835007), the National Natural Science Foundation of China (Grant Nos. 61675123, 61775124, and 11804202), and the Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT_17R70). |
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Corresponding Authors:
†Corresponding author. E-mail: zhaojm@sxu.edu.cn
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Cite this article:
Jiabei Fan(樊佳蓓), Yunhui He(何云辉), Yuechun Jiao(焦月春), Liping Hao(郝丽萍), Jianming Zhao(赵建明), and Suotang Jia(贾锁堂) Nonlinear spectroscopy of three-photon excitation of cesium Rydberg atoms in vapor cell 2021 Chin. Phys. B 30 034207
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