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Three-stage laser cooling of Sr atoms using the5s5pP23metastable state below Doppler temperatures
Physical Review A ( IF 2.9 ) Pub Date : 2021-02-25 , DOI: 10.1103/physreva.103.023331
Tomoya Akatsuka , Koji Hashiguchi , Tadahiro Takahashi , Noriaki Ohmae , Masao Takamoto , Hidetoshi Katori

We report three-stage laser cooling of Sr atoms using the 5s2S01 ground state and the 5s5pP23 metastable state. Sr87 atoms are precooled in a magneto-optical trap simultaneously operated on the 5s2S015s5pP11 transition at 461 nm and on the 5s5pP235s5dD33 transition at 496 nm. Atoms optically pumped to the 5s5pP23(F=13/2) state are magneto-optically trapped and cooled down to 2.5(2) μK on the 5s5pP235s4dD33 transition at 2.9μm. Using this transition, we investigate one dimensional polarization gradient cooling of Sr88 atoms, which have simple energy levels without hyperfine structure, down to 0.22(18) μK or 17 times the recoil temperature. We discuss prospects for continuous generation of ultracold Sr atoms combined with a state transfer technique.

中文翻译:

在低于多普勒温度的5s5pP23可转移状态下对Sr原子进行三阶段激光冷却

我们报告了使用Sr原子的三阶段激光冷却 5s2个小号01个 基态与 5s5pP2个3 亚稳态。 r87 原子在磁光阱中预冷,同时在 5s2个小号01个5s5pP1个1个 在461 nm处的跃迁 5s5pP2个35s5dd33在496 nm处跃迁。原子光学泵浦到5s5pP2个3F=13/2个 状态被磁光捕获并冷却至2.5(2) μķ5s5pP2个35s4dd33 在过渡 2.9μ。利用这种转变,我们研究了一维极化梯度冷却r88 原子,具有简单的能级,没有超精细结构,低至0.22(18) μķ或反冲温度的17倍。我们讨论了结合状态转移技术连续生成超冷Sr原子的前景。
更新日期:2021-02-25
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