Transverse Confinement of Photon Position in the Light-Atom Interaction

In an atom interferometry experiment, the output phase shift depends on wave vector of photons and recoil momentum in optical transitions. This Letter puts forward a hypothesis that light-atom interaction, function could provide transverse confinement to thus affect mean momentum. We propose model analyze photon effective monochromatic field calculate relative $|{\stackrel{\ensuremath{\rightarrow}}{k}}_{\mathrm{eff}}|$ $k$ when with 3D Gaussian absorbs one beam. lead systematic effect related spatial distribution atoms beam profile high-precision experiments based interferometry.