Beam focus and longitudinal polarization influence on spin dynamics in the Kapitza-Dirac effect
arXiv:2103.07121 · doi:10.1103/PhysRevA.105.053123
Abstract
We theoretically investigate the influence of a longitudinal laser polarization component from beam focusing on spin dynamics in Kapitza-Dirac scattering by solving the relativistic Dirac equation with time-dependent perturbation theory. The transverse spacial dependence of the longitudinal beam polarization component is accounted for, by approximating a Gaussian beam with plane-wave components. We find that corrections from a longitudinal laser beam polarization component approximately scale with the second power of the diffraction angle , from which we conclude that a related influence from beam focusing can be made negligibly small for sufficiently low beam foci.
arXiv comment16 pages, 6 figures
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