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Sideband-Enhanced Cold Atomic Source for Optical Clocks
Physical Review Applied ( IF 4.6 ) Pub Date : 2020-01-09 , DOI: 10.1103/physrevapplied.13.014013
Matteo Barbiero , Marco G. Tarallo , Davide Calonico , Filippo Levi , Giacomo Lamporesi , Gabriele Ferrari

We demonstrate the enhancement and optimization of a cold strontium atomic beam from a two-dimensional magneto-optical trap (2D MOT) transversely loaded from a collimated atomic beam by adding a sideband frequency to the cooling laser. The parameters of the cooling and sideband beams are scanned to achieve the maximum atomic beam flux and are compared with Monte Carlo simulations. We obtain a 2.3 times larger total atomic flux and a brightness increase of a factor 4 compared with a conventional, single-frequency 2D MOT for a given total power of 200 mW. We show that the sideband-enhanced 2D MOT can reach the loading-rate performances of space-demanding Zeeman-slower-based systems, while it can overcome systematic effects due to thermal-beam collisions and hot-black-body-radiation shift, making it suitable for both transportable and accurate optical lattice clocks. Finally, we numerically study possible extensions of the sideband-enhanced 2D MOT to other alkaline-earth species.

中文翻译:

光学时钟的边带增强型冷原子源

我们通过向冷却激光器添加边带频率,展示了从准直原子束横向加载的二维磁光阱(2D MOT)产生的冷锶原子束的增强和优化。扫描冷却束和边带束的参数以获得最大的原子束通量,并与蒙特卡洛模拟进行比较。对于给定的200 mW总功率,与传统的单频2D MOT相比,我们获得了2.3倍的总原子通量,亮度增加了4倍。我们表明,增强边带的2D MOT可以达到对空间要求很高的塞曼减慢系统的负载率性能,同时它可以克服由于热束碰撞和黑体辐射移动而引起的系统性影响,使其既适用于便携式又适用于精确的光学晶格时钟。最后,我们通过数值研究将边带增强的2D MOT扩展到其他碱土物种。
更新日期:2020-01-09
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