Nonlinear absorption of ultrapower laser radiation by relativistic underdense plasma

TL;DR

This paper investigates how ultra-powerful laser radiation is nonlinearly absorbed by relativistic underdense plasma through stimulated bremsstrahlung, focusing on high-intensity and high-temperature conditions.

Contribution

It introduces a detailed analysis of nonlinear inverse-bremsstrahlung absorption in relativistic Maxwellian plasma at extreme laser intensities and electron temperatures.

Findings

Absorption coefficient increases with laser field strength.

High electron temperatures significantly enhance absorption.

Theoretical model applies to low-frequency regimes.

Abstract

The nonlinear absorption of laser radiation of relativistic intensities in the underdense plasma by a mechanism of stimulated bremsstrahlung of electrons on the ions/nuclei is investigated in the low frequency approximation. Coefficient of nonlinear inverse-bremsstrahlung absorption is studied for relativistic Maxwellian plasma at asymptotically large values of laser fields and high temperatures of electrons.