Non-linear Compton scattering of ultrahigh-intensity laser pulses

TL;DR

This paper investigates the photon emission spectrum in non-linear Compton scattering involving ultra-strong, pulsed laser fields and relativistic electrons, revealing significantly increased photon yields at ultrahigh intensities.

Contribution

It introduces a method combining averaging over sub-structures and stationary phase approximation to accurately evaluate photon emission probabilities in pulsed ultra-intense laser fields.

Findings

Photon yield up to ten times higher than monochromatic calculations

Enhanced understanding of photon spectra in ultrahigh-intensity regimes

Effective evaluation techniques for total emission probability

Abstract

We present results for the photon spectrum emitted in non-linear Compton scattering of pulsed ultra-strong laser fields off relativistic electrons for intensities up to $a_0\gtrsim 100$ and pulse lengths of a few laser cycles. At ultrahigh laser intensity, it is appropriate to average over the sub- structures of the differential photon spectrum. Supplementing this procedure with a stationary phase approximation one can evaluate the total emission probability. We find the photon yield in pulsed fields to be up to a factor of ten larger than results obtained from a monochromatic wave calculation.