Tian Zhuangzhuang, Chang Haobo, Lv Xin, Yang Mengna, Wang Zhihui, Yang Pengfei, Zhang Pengfei, Li Gang, Zhang Tiancai
Opt Lett. 2024 Feb 1;49(3):542-545. doi: 10.1364/OL.514160.
We developed a resolved Raman sideband cooling scheme that can efficiently prepare a single optically trapped cesium (Cs) atom in its motional ground states. A two-photon Raman process between two outermost Zeeman sublevels in a single hyperfine state is applied to reduce the phonon number. Our scheme is less sensitive to the variation in the magnetic field than the commonly used scheme where the two outermost Zeeman sublevels belonging to the two separate ground hyperfine states are taken. Fast optical pumping with less spontaneous emission guarantees the efficiency of the cooling process. After cooling for 50 ms, 82% of the Cs atoms populate their three-dimensional ground states. Our scheme improves the long-term stability of Raman sideband cooling in the presence of magnetic field drift and is thus suitable for cooling other trapped atoms or ions with abundant magnetic sublevels.
我们开发了一种分辨拉曼边带冷却方案，该方案能够有效地将单个光学捕获的铯（Cs）原子制备到其运动基态。应用单个超精细态中两个最外层塞曼子能级之间的双光子拉曼过程来减少声子数。与常用方案相比，我们的方案对磁场变化的敏感度较低，常用方案采用的是属于两个不同基态超精细态的两个最外层塞曼子能级。具有较少自发辐射的快速光抽运保证了冷却过程的效率。冷却50毫秒后，82%的Cs原子处于其三维基态。我们的方案提高了在存在磁场漂移情况下拉曼边带冷却的长期稳定性，因此适用于冷却其他具有丰富磁子能级的捕获原子或离子。
