High-flux, adjustable, compact cold-atom source.
High-flux, adjustable, compact cold-atom source.
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DOI：
10.1364/oe.423662
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发表时间：
2021-01
期刊：
影响因子：
3.8
通讯作者：
Sean Ravenhall;B. Yuen;C. Foot
中科院分区：
文献类型：
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作者：
Sean Ravenhall;B. Yuen;C. Foot
磁光阱（MOT）被广泛应用于激光冷却原子。我们已经开发出一种基于金字塔MOT的高通量紧凑型冷原子源，具有独特的可调孔径，非常适合便携式量子技术设备，包括天基实验。可调节性使得能够调查以前未探索的孔径大小对原子通量的影响，并且孔径大小的优化使我们能够证明比使用金字塔，LVIS，3D-MOT或光栅MOT的任何报道的冷原子源更高的通量。实验获得了2.1 × 10 ~（10）atoms/s的~（87）Rb平均速度为32（1）m/s，半高宽为27.6（9）m/s，发散角为59（4）mrad。将总光功率减半至195 mW仅导致通量减少20%，平均速度减少30%。已经确定了根据需要进一步降低速度的方法。低功耗和小尺寸使这种设计适用于各种冷原子技术。
Magneto-optical traps (MOTs) are widely used for laser cooling of atoms. We have developed a high-flux compact cold-atom source based on a pyramid MOT with a unique adjustable aperture that is highly suitable for portable quantum technology devices, including space-based experiments. The adjustability enabled an investigation into the previously unexplored impact of aperture size on the atomic flux, and optimisation of the aperture size allowed us to demonstrate a higher flux than any reported cold-atom sources that use a pyramid, LVIS, 3D-MOT or grating MOT. We achieved 2.1(1) × 1010 atoms/s of 87Rb with a mean velocity of 32(1) m/s, FWHM of 27.6(9) m/s and divergence of 59(4) mrad. Halving the total optical power to 195 mW caused only a 20% reduction of the flux, and a 30% decrease in mean velocity. Methods to further decrease the velocity as required have been identified. The low power consumption and small size make this design suitable for a wide range of cold-atom technologies.