Chin. Phys. Lett.  2018, Vol.35 Issue (12): 123701-  DOI:10.1088/0256-307X/35/12/123701
Sub-Doppler Laser Cooling of $^{23}$Na in Gray Molasses on the $D_{2}$ Line
1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 0300062Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006

### 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.

### 基金资助

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.

### 引用本文

[英文]
Zhenlian Shi, Ziliang Li, Pengjun Wang, Zengming Meng, Lianghui Huang, Jing Zhang. Sub-Doppler Laser Cooling of $^{23}$Na in Gray Molasses on the $D_{2}$ Line[J]. CPL, 2018, 35(12): 123701-.

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