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arXiv 1502.07240physics.atom-ph
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镱的小磁场双色磁光阱

Two-Color Magneto-Optical Trap with Small Magnetic Field for Ytterbium

Akio Kawasaki, Boris Braverman, QinQin Yu, Vladan Vuletić

摘要:

报道了一种镱原子的双色磁光阱(MOT),在低至2 G/cm的低磁场梯度下工作,传统的单重态跃迁(6s^2 1 S 0-> 6s 6p 1 P1)MOT无法捕获原子.通过同时对宽线宽单重态跃迁和窄线宽三重态跃迁(6s^2 1 S 0-> 6s 6p 3 P1)施加激光,我们在700 K下直接从原子束中加载并捕获了4.0 x 10^5个原子。在双色MOT中,减慢和捕获功能分别由单重态跃迁光和三重态跃迁光执行。即使在非常低的磁场梯度下,双色MOT对激光功率不平衡也具有高度鲁棒性。

英文摘要:

We report a two-color magneto-optical trap (MOT) for ytterbium atoms operating at a low magnetic field gradient down to 2 G/cm where a conventional MOT using the singlet transition (6s^2 1S0 -> 6s6p 1P1) is unable to trap atoms. By simultaneously applying laser light on both the broad-linewidth singlet transition and the narrow-linewidth triplet transition (6s^2 1S0 -> 6s6p 3P1), we load and trap 4.0 x 10^5 atoms directly from an atomic beam at 700 K. In the two-color MOT, the slowing and trapping functions are separately performed by the singlet transition light and the triplet transition light, respectively. The two-color MOT is highly robust against laser power imbalance even at very low magnetic field gradients.

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