Narrow-line magneto-optical trap for europium
Narrow-line magneto-optical trap for europium
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DOI：
10.1103/physreva.103.053122
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发表时间：
2021-05-26
影响因子：
2.9
通讯作者：
Kozuma, Mikio
中科院分区：
文献类型：
--
作者：
Miyazawa, Yuki;Inoue, Ryotaro;Kozuma, Mikio
我们报告了使用自然线宽为 97 kHz 的窄线冷却转变实现了铕原子的磁光陷阱 (MOT)。铕是一种强偶极物质，具有有趣的特性，例如存在超精细结构和不存在电子轨道角动量。我们 MOT 的出发点是连续捕获和冷却光泵浦亚稳态铕原子。我们对亚稳态和基态原子采用了同步 MOT。捕获的亚稳态原子被连续泵送回基态，然后连续加载到窄线 MOT，其中最多捕获 4.7 x 10(7) 个原子。通过压缩过程获得了温度为6μK、峰值数密度为2.2×10(11)cm(-3)的自旋极化样品，相空间密度为3×10(-5)。
We report on the realization of a magneto-optical trap (MOT) for europium atoms using a narrow-line cooling transition with a natural linewidth of 97 kHz. Europium is a strongly dipolar species with interesting properties, such as the presence of hyperfine structure and the absence of electronic orbital angular momentum. Our starting point of the MOT is continuous capturing and cooling of optically pumped metastable europium atoms. We have employed simultaneous MOT for the metastable and ground-state atoms. The trapped metastable atoms are successively pumped back to the ground state and then continuously loaded to the narrow-line MOT, where up to 4.7 x 10(7) atoms are captured. A spin-polarized sample at a temperature of 6 mu K and with a peak number density of 2.2 x 10(11) cm(-3) is obtained through the compression process, resulting in a phase space density of 3 x 10(-5).