We demonstrate a compact magneto-optical trap (MOT) of alkaline-earth atoms using a nanofabricated diffraction grating chip. A single input laser beam, resonant with the broad 1S0 → 1P1 transition of strontium, forms the MOT in combination with three diffracted beams from the grating chip and a magnetic field produced by permanent magnets. A differential pumping tube limits the effect of the heated, effusive source on the background pressure in the trapping region. The system has a total volume of around 2.4 l. With our setup, we have trapped up to 5 × 106 88Sr atoms at a temperature of ∼6 mK, and with a trap lifetime of ∼1 s. Our results will aid the effort to miniaturize quantum technologies based on alkaline-earth atoms.

中文翻译：

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光栅磁光阱中碱土元素的限制

我们使用纳米制造的衍射光栅芯片展示了碱土原子的紧凑磁光陷阱 (MOT)。单一输入激光束与锶的 1S0 → 1P1 宽跃迁共振，与来自光栅芯片的三束衍射光束和永磁体产生的磁场相结合，形成 MOT。差动泵管限制了加热的喷出源对捕集区背景压力的影响。该系统的总体积约为 2.4 升。通过我们的设置，我们在~6 mK 的温度下俘获了多达 5 × 106 个 88Sr 原子，并且陷阱寿命约为 1 s。我们的结果将有助于使基于碱土原子的量子技术小型化。