Sitaram A, Elgee P K, Campbell G K, Klimov N N, Eckel S, Barker D S
Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Sensor Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Rev Sci Instrum. 2020 Oct 1;91(10):103202. doi: 10.1063/5.0019551.
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 S → P 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 × 10 Sr 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.
我们展示了一种使用纳米制造衍射光栅芯片的碱土原子紧凑型磁光阱（MOT）。一束与锶的宽S→P跃迁共振的单输入激光束，与来自光栅芯片的三束衍射光束以及由永久磁铁产生的磁场相结合，形成了磁光阱。一个差分抽气管限制了加热的、喷射源对捕获区域背景压力的影响。该系统的总体积约为2.4升。通过我们的装置，我们在约6 mK的温度下捕获了多达5×10⁴个锶原子，捕获寿命约为1秒。我们的结果将有助于推动基于碱土原子的量子技术小型化。
