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arXiv · 2012.05920

Pulse envelope effect on nonlinear Compton scattering in electron-laser collisions

B. King
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Abstract

Nonlinear Compton scattering is calculated for the collision of an electron with a plane wave pulse. A mid infra-red (IR) peak arises in the photon spectrum due to long-range interference associated with the pulse envelope. The case of a flat-top pulse is studied as a toy model for pulse envelope effects and reduced to two final-state momentum integrations; the case of a sine-squared pulse is studied numerically. A perturbative expansion in charge-field coupling reveals that already at intermediate intensities, many orders are required to correctly capture the structure of the mid-IR peak. By regularising the classical result, it is shown that the mid-IR peak is due to plane-wave ponderomotive effects on the pulse envelope. Finally, it is shown that the mid-IR peak can be isolated using energy, angle and polarisation filters.

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B. King. 2020-12-10. Pulse envelope effect on nonlinear Compton scattering in electron-laser collisions. https://doi.org/10.1103/physrevd.103.036018

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