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Characterization of nonlinear spectral linewidth and light shift in diffuse laser-cooled atoms |
| Yiran Yin(殷怡然), An-Ning Xu(许安宁), Jin Peng(彭瑾), and Bei Liu(刘贝)† |
| Key Laboratory of Laser and Infrared System, Ministry of Education, Center for Optics Research and Engineering (CORE), Shandong University, Qingdao 266237, China |
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Abstract We demonstrate an integrating sphere to cool $^{87}\rm Rb$ atoms and measure the recoil-induced resonance and electromagnetically induced absorption spectrum. We measure the relationship between their linewidth and light shift with variation of the detuning and power of the cooling laser and study the performance of the diffuse laser cooling mechanism by the absorption linewidth radio $\Delta\nu_{\rm E}/\Delta\nu_{\rm R}$ and light shift $\lvert{\varDelta_{\rm R}-\varDelta_{\rm E}}\rvert$ using nonlinear spectroscopy. Specifically, when $\Delta\nu_{\rm E}/\Delta\nu_{\rm R}$ reaches a value of 1.57, the temperature and number of cold atoms achieve the optimal cooling effect. This characterization of absorption linewidth and light shift will provide a method to estimate whether diffuse light cooling achieves the best cooling effect, contributing to the future development of isotropic laser cooling for application in quantum sensing.
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Received: 12 September 2024
Revised: 14 November 2024
Accepted manuscript online: 02 December 2024
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PACS:
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34.35.+a
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(Interactions of atoms and molecules with surfaces)
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37.10.De
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(Atom cooling methods)
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47.80.Cb
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(Velocity measurements)
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82.53.Kp
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(Coherent spectroscopy of atoms and molecules)
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| Fund: Project supported by Shandong Provincial Natural Science Foundation (Grant No. ZR2023LLZ003), the National Natural Science Foundation of China (Grant No. 62005145), Fundamental Research Fund of Shandong University, and Shandong Provincial Postdoctoral Science Foundation (Grant No. SDBX202302002). |
Corresponding Authors:
Bei Liu
E-mail: beiliu@sdu.edu.cn
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Cite this article:
Yiran Yin(殷怡然), An-Ning Xu(许安宁), Jin Peng(彭瑾), and Bei Liu(刘贝) Characterization of nonlinear spectral linewidth and light shift in diffuse laser-cooled atoms 2025 Chin. Phys. B 34 023401
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