| ATOMIC AND MOLECULAR PHYSICS |
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Sub-Doppler Laser Cooling of $^{23}$Na in Gray Molasses on the $D_{2}$ Line |
| Zhenlian Shi1,2, Ziliang Li1,2, Pengjun Wang1,2**, Zengming Meng1,2, Lianghui Huang1,2, Jing Zhang1,2** |
1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 030006
2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006
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| Cite this article: |
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Zhenlian Shi, Ziliang Li, Pengjun Wang et al 2018 Chin. Phys. Lett. 35 123701 |
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Abstract We report on the efficient gray molasses cooling of sodium atoms using the $D_{2}$ optical transition at 589.1 nm. Thanks to the hyperfine split about 6${\it \Gamma}$ between $|F'=2\rangle$ and $|F'=3\rangle$ in the excited state 3$^{2}P_{3/2}$, this atomic transition is effective for the gray molasses cooling mechanism. Using this cooling technique, the atomic sample in $F=2$ ground manifold is cooled from 700 $\mu$K to 56 $\mu$K in 3.5 ms. We observe that the loading efficiency into magnetic trap is increased due to the lower temperature and high phase space density of atomic cloud after gray molasses. This technique offers a promising route for the fast cooling of the sodium atoms in the $F=2$ state.
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Received: 14 September 2018
Published: 23 November 2018
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| Fund: Supported by the National Key Research and Development Program of China under Grant No 2016YFA0301602, the National Natural Science Foundation of China under Grant Nos 11474188 and 11704234, the National Key Research and Development Program of China under Grant No 2018YFA0307601, the Fund for Shanxi '1331 Project' Key Subjects Construction, and the Program of Youth Sanjin Scholar. |
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