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arXiv · 2003.05799

Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms

K Bhardwaj·S P Ram·S Singh·V B Tiwari·S R Mishra
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Abstract

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.

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K Bhardwaj, S P Ram, S Singh, V B Tiwari, S R Mishra. 2020-03-12. Effect of AC-Stark shift in optical dipole trap on absorption imaging of trapped atoms. https://doi.org/10.1088/1402-4896%2Fabc5f1

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