磁光阱中超导原子的亚多普勒激光冷却
Sub-Doppler Laser Cooling of Thulium Atoms in a Magneto-optical Trap
摘要：
实验研究了磁光阱中410.6nm波长的亚多普勒激光冷却。在没有任何专门的糖蜜亚多普勒冷却期的情况下，观察到温度为25（5）\，$μ$ K的$3\times 10^6$原子云。测得的温度明显低于在410.6nm处冷却转变的多普勒极限240 $μ$ K。亚多普勒冷却过程的高效率是由于较低$4f^{13}6s^{2}\, (J\,=\,{7}/{2})$和较高$4f^{12}5d_{3/2}6s^{2}\, (J\,=\,{9}/{2})$冷却水平的Landé- $g$因子的近简并。
英文摘要：
We have experimentally studied sub-Doppler laser cooling in a magneto-optical trap for thulium atoms working at the wavelength of 410.6\,nm. Without any dedicated molasses period of sub-Doppler cooling, the cloud of $3\times 10^6$ atoms at the temperature of 25(5)\,$μ$K was observed. The measured temperature is significantly lower than the Doppler limit of 240$μ$K for the cooling transition at 410.6\,nm. High efficiency of the sub-Doppler cooling process is due to a near-degeneracy of the Landé-$g$ factors of the lower $4f^{13}6s^{2}\, (J\,=\,{7}/{2})$ and the upper $4f^{12}5d_{3/2}6s^{2}\, (J\,=\,{9}/{2})$ cooling levels.}
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