光学偶极阱中铷原子5S_(1/2)及5P_(3/2)态的AC Stark频移

基于二能级模型和多能级模型,分析计算了由强聚焦高斯光束形成的光学偶极阱中87Rb原子5S1/2态和5P3/2态的AC Stark频移。基于多能级模型,针对在852 nm高斯激光束强聚焦所形成的87Rb原子远失谐光学偶极阱中进行偏振梯度冷却的情形,计算了冷却循环跃迁(5S1/2F=2-5P3/2F′=3)的频移量,结果显示频移对molasses冷却过程产生了重要的影响。同时,计算了5S1/2|F=2,mF=±2〉态和5P3/2|F′=3,mF=±3〉态的AC Stark频移随光学偶极阱激光波长的变化情况,发现在红失谐情况下,对于87Rb原子5S1/2-5P3/2态跃迁不存在魔数波长。

Calculation of AC Stark shift of 5S1/2 and 5P3/2 states of Rb atoms in optical dipole trap

Based on the two-level and multi-level models, the AC Stark shift of the 5S1/2 and 5P3/2 states of ⁸⁷Rb atoms in an Optical Dipole Trap(ODT) formed by a strongly-focused single Gaussian laser beam is analyzed and calculated. For performance of molasses cooling of 87Rb atoms in the Far-off-resonance Trap(FORT) by 852 nm Gaussian laser beam, the AC Stark shift of 5S1/2F=2-5P3/2F'=3 cycling transition for cooling is also calculated, results show that the frequency shift has an important impact on the molasses cooling process. Furthermore, the AC Stark shift of ⁸⁷Rb 5S1/2|F=2,|mF=±2〉 and 5P3/2|F'=3,|mF=±3〉 states versus the wavelength of the ODT laser is analyzed, which shows that there is no magic wavelength for 5S1/2-5P3/2 transition of ⁸⁷Rb atoms in the red-off-resonance condition.