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**
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 0300062 Collaborative 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.
收稿日期: 2018-09-14
出版日期: 2018-11-23
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2018, Vol. 35 
