论文标题
光学偶极子陷阱中AC-Stark Sphing对被困原子吸收成像的影响
Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms
论文作者
论文摘要
在目前的工作中，已经研究了已偶极偶极子陷阱中AC-Stark Shings（即轻移）对被困原子的原位吸收探针成像的影响。我们已经计算了各种能量水平的$^{87} $ rb原子与捕获光学偶极子陷阱（ODT）相关的轻移。 ODT光束的空间变化强度导致位置依赖于轻移（即AC-Stark Shift）。原子能量水平的这种修饰会导致吸收横截面的修饰，最终在给定的成像探针梁的给定波长下修饰了原位吸收成像中的光密度（OD）。在图像分析中将轻移液融合在一起，已经估计了捕获云的实验观察到的吸收图像的光学偶极陷阱中的正确数量原子。原位成像和这项工作对于估算捕获原子云的蒸发冷却过程中陷阱的瞬时损失率可能很有用。
In the present work, the effect of AC-Stark shift (i.e. light-shift) in optical dipole trap on in-situ absorption probe imaging of the trapped atoms has been investigated. We have calculated the light-shift of various energy levels of $^{87}$Rb atoms relevant for trapping in an optical dipole trap (ODT). The spatial varying intensity of the ODT beam results in position dependent light-shift (i.e. AC-Stark shift). Such modifications in the energy levels of the atom result in modification in the absorption cross-section, which finally modifies the optical density (OD) in in-situ absorption imaging at a given wavelength of imaging probe beam. Incorporating the light-shift in analysis of images, the correct number of atoms in the optical dipole trap has been estimated for the experimentally observed absorption images of the trapped cloud. The in-situ imaging and this work can be useful in estimating the instantaneous loss rate from the trap during the evaporative cooling of trapped atom cloud.
