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

TL;DR

This paper investigates how the pulse envelope influences nonlinear Compton scattering spectra, revealing a mid-IR peak caused by ponderomotive effects and demonstrating methods to isolate this feature.

Contribution

It introduces a detailed analysis of pulse envelope effects on nonlinear Compton scattering, including a perturbative approach and regularization to identify the mid-IR peak's origin.

Findings

Mid-IR peak arises from pulse envelope interference.

Many orders in perturbation theory are needed at intermediate intensities.

Mid-IR peak can be isolated with filters.

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.