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Coherent 420 nm laser beam generated by four-wave mixing in Rb vapor with a single continuous-wave laser |
| Hao Liu(刘浩)1,2, Jin-Peng Yuan(元晋鹏)1,2, Li-Rong Wang(汪丽蓉)1,2, Lian-Tuan Xiao(肖连团)1,2, Suo-Tang 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 demonstrate the generation of the coherent 420 nm laser via parametric four-wave mixing process in Rb vapor. A single 778 nm laser with circular polarization is directly injected into a high-density atomic vapor, which drives the atoms from the 5S1/2 state to the 5D5/2 state with monochromatic two-photon transition. The frequency up-conversion laser is generated by the parametric four-wave mixing process under the phase matching condition. This coherent laser is firstly certified by the knife-edge method and a narrow range grating spectrometer. Then the generated laser power is investigated in terms of the power and frequency of the incoming beam as well as the density of the atoms. Finally, a 420 nm coherent laser with power of 19 μW and beam quality of Mx2 =1.32, My2 =1.37 is obtained with optimal experimental parameters. This novel laser shows potential prospects in the measurement of material properties, information storage, and underwater optical communication.
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Received: 07 January 2020
Revised: 04 February 2020
Accepted manuscript online:
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PACS:
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32.80.-t
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(Photoionization and excitation)
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42.65.-k
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(Nonlinear optics)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: Project supported by the National R&D Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant Nos. 61875112, 61705122, 91736209, and 61728502), the Program for Sanjin Scholars of Shanxi Province, China, the Applied Basic Research Project of Shanxi Province, China (Grant No. 201701D221004), the Key Research and Development Program of Shanxi Province for International Cooperation, China (Grant No. 201803D421034), and 1331KSC. |
Corresponding Authors:
Jin-Peng Yuan, Li-Rong Wang
E-mail: yjp@sxu.edu.cn;wlr@sxu.edu.cn
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Cite this article:
Hao Liu(刘浩), Jin-Peng Yuan(元晋鹏), Li-Rong Wang(汪丽蓉), Lian-Tuan Xiao(肖连团), Suo-Tang Jia(贾锁堂) Coherent 420 nm laser beam generated by four-wave mixing in Rb vapor with a single continuous-wave laser 2020 Chin. Phys. B 29 043203
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