中国光学, 2010, 3 (2): 119, 网络出版: 2010-12-07
光学偶极阱中铷原子5S1/2及5P3/2态的AC Stark频移
Calculation of AC Stark shift of 5S1/2 and 5P3/2 states of Rb atoms in optical dipole trap
87Rb AC Stark频移 光学偶极阱 远失谐光学偶极阱 多能级模型 87Rb AC Stark shift Optical Dipole Trap(ODT) Far-Off-Resonance Trap(FORT) multi-level model
摘要
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。
Abstract
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.
成永杰, 邱英, 何军, 张天才, 王军民. 光学偶极阱中铷原子5S1/2及5P3/2态的AC Stark频移[J]. 中国光学, 2010, 3(2): 119. CHENG Yong-jie, QIU Ying, HE Jun, ZHANG Tian-cai, WANG Jun-min. Calculation of AC Stark shift of 5S1/2 and 5P3/2 states of Rb atoms in optical dipole trap[J]. Chinese Optics, 2010, 3(2): 119.
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