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Enhanced optical molasses cooling for Cs atoms with largely detuned cooling lasers |
| Di Zhang(张迪)1, Yu-Qing Li(李玉清)1,2, Yun-Fei Wang(王云飞)1, Yong-Ming Fu(付永明)1, Peng Li(李鹏)1, Wen-Liang Liu(刘文良)1,2, Ji-Zhou Wu(武寄洲)1,2, Jie Ma(马杰)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, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China;
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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Abstract We report a detailed study of the enhanced optical molasses cooling of Cs atoms, whose large hyperfine structure allows to use the largely red-detuned cooling lasers. We find that the combination of a large frequency detuning of about -110 MHz for the cooling laser and a suitable control for the powers of the cooling and repumping lasers allows to reach a cold temperature of ~5.5 μK. We obtain 5.1×107 atoms with the number density around 1×1012 cm-3. Our result gains a lower temperature than that got in other experiments, in which the cold Cs atoms with the temperature of ~10 μK have been achieved by the optical molasses cooling.
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Received: 11 October 2019
Revised: 29 November 2019
Accepted manuscript online:
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PACS:
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32.10.Fn
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(Fine and hyperfine structure)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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37.10.-x
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(Atom, molecule, and ion cooling methods)
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37.10.De
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(Atom cooling methods)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant Nos. 61722507, 61675121, and 61705123), PCSIRT (Grant No. IRT17R70), the 111 Project (Grant No. D18001), the Shanxi 1331 KSC, the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT), the Applied Basic Research Project of Shanxi Province, China (Grant No. 201701D221002), the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, and the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics. |
Corresponding Authors:
Yu-Qing Li
E-mail: lyqing.2006@163.com
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Cite this article:
Di Zhang(张迪), Yu-Qing Li(李玉清), Yun-Fei Wang(王云飞), Yong-Ming Fu(付永明), Peng Li(李鹏), Wen-Liang Liu(刘文良), Ji-Zhou Wu(武寄洲), Jie Ma(马杰), Lian-Tuan Xiao(肖连团), Suo-Tang Jia(贾锁堂) Enhanced optical molasses cooling for Cs atoms with largely detuned cooling lasers 2020 Chin. Phys. B 29 023203
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