Diffusive Suppression of AC-Stark Shifts in Atomic Magnetometers
  In atomic magnetometers, the vector AC-Stark shift associated with circularly polarized light generates spatially varying effective magnetic fields which limit the magnetometer response and serve as sources of noise. We describe a scheme whereby optically pumping a small sub-volume of the magnetometer cell and relying on diffusion to transport polarized atoms allows a magnetometer to be operated with minimal sensitivity to the AC-Stark field. 
I. A. Sulai, R. Wyllie, M. Kauer, G. S. Smetana, R. T. Wakai, and T.   G. Walker
physics.atom-ph physics.med-ph