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

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.

12 pages, 8 figures

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• Advances in QED with intense background fields
• From local to nonlocal: higher fidelity simulations of photon emission in intense laser pulses
• Simulations of laser-driven strong-field QED with Ptarmigan: Resolving wavelength-scale interference and $\gamma$-ray polarization
• Higher fidelity simulations of nonlinear Breit-Wheeler pair creation in intense laser pulses
• Pulse envelope effects in nonlinear Breit-Wheeler pair-creation
• High-resolution modeling of nonlinear Compton scattering in focused laser pulses
• Locally monochromatic two-step nonlinear trident process in a plane wave
• Generation of quasi-monoenergetic positron beams in chirped laser fields
• Positron energy distribution in factorized trident process