汽态磁光阱中铯原子的增强拉曼边带冷却
Enhanced Raman sideband cooling of caesium atoms in a vapour-loaded magneto-optical trap
摘要：
本文报道了铯原子在标准单池汽态磁光阱中的三维简并拉曼边带冷却（3D DRSC）。我们的改进方案包括使用单独的再泵浦激光器和优化的晶格失谐。我们将$1.5 \times 10^7$原子加载到拉曼晶格中，失谐量为-15.5 GHz（到基态F = 3）。利用增强型3D DRSC在12 ms内将它们从60 $μ$ K冷却到1.7 $μ$ K，获得的原子数约为$1.2 \times 10^7$。提出了一个理论模型来模拟测量的被困原子数。计算结果与实验数据吻合较好。该技术为在单电池系统中将大量超冷Cs原子加载到交叉偶极阱和高效蒸发冷却中铺平了道路。
英文摘要：
We report enhanced three-dimensional degenerated Raman sideband cooling (3D DRSC) of caesium (Cs) atoms in a standard single-cell vapour-loading magneto-optical trap. Our improved scheme involves using a separate repumping laser and optimized lattice detuning. We load $1.5 \times 10^7$ atoms into the Raman lattice with a detuning of -15.5 GHz (to the ground F = 3 state). Enhanced 3D DRSC is used to cool them from 60 $μ$K to 1.7 $μ$K within 12 ms and the number of obtained atoms is about $1.2 \times 10^7$. A theoretical model is proposed to simulate the measured number of trapped atoms. The result shows good agreement with the experimental data. The technique paves the way for loading a large number of ultracold Cs atoms into a crossed dipole trap and efficient evaporative cooling in a single-cell system.
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