Values of various parameters during the sub-Doppler cooling stage

<b>Table 2.</b> Values of various parameters during the sub-Doppler cooling stage. <strong>Abstract</strong> We report the rapid accelerated thermalization of potassium (³⁹K) atoms loaded in a magnetic trap, in the presence of a single dipole trap beam. More than an order of magnitude reduction in the thermalization time, to less than a second, is observed with the focused off-resonant beam occupying only 0.01% of the volume of the magnetic trap. A new method for testing for thermalization of relatively hot clouds is devised. The cold atoms are loaded from a magneto-optical trap (MOT) of ³⁹K that has gone through a compressed MOT and sub-Doppler cooling stage. The atoms are prepared in the magnetically stretched |<em>F</em> = 2, <em>m_F</em> = 2〉 state prior to loading into the hybrid trap. We also report a direct loading of ³⁹K atoms, prepared in the state |<em>F</em> = 1〉, into a single beam dipole trap.

表2. 亚多普勒冷却（sub-Doppler cooling）阶段各参数取值。摘要：我们报道了单偶极阱光束存在下，磁阱中装载的³⁹K原子的快速加速热化过程。研究发现，仅占据磁阱体积0.01%的聚焦失谐光束可将热化时间缩短一个数量级以上，降至1秒以内。我们设计了一种针对相对热原子云的热化测试新方法。冷原子由经历了压缩磁光阱（MOT）与亚多普勒冷却阶段的³⁹K磁光阱装载而来。原子在被装载至混合阱前，均制备于磁致拉伸态|F=2, m_F=2〉。我们还报道了将制备于|F=1〉态的³⁹K原子直接装载至单光束偶极阱的实验结果。