Beam focus and longitudinal polarization influence on spin dynamics in the Kapitza-Dirac effect

• URL: http://arxiv.org/abs/2103.07121v4
• Date: Wed, 1 Jun 2022 13:12:33 GMT
• Title: Beam focus and longitudinal polarization influence on spin dynamics in the Kapitza-Dirac effect
• Authors: Sven Ahrens and Ziling Guan and Baifei Shen
• Abstract summary: We investigate the influence of a longitudinal laser polarization component from beam focusing on spin dynamics in Kapitza-Dirac scattering. We find that corrections from a longitudinal laser beam polarization component approximately scale with the second power of the diffraction angle $epsilon$, from which we conclude that a related influence from beam focusing can be made negligibly small for sufficiently low beam.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $\epsilon$, from which we conclude that a related influence from beam focusing can be made negligibly small for sufficiently low beam foci.

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