Nonlinear absorption of high-intensity shortwave radiation in plasma within relativistic quantum theory

TL;DR

This paper derives the nonlinear absorption rate of high-intensity shortwave radiation in plasma using relativistic quantum theory, considering both classical and quantum plasmas, and highlights the dependence on laser polarization.

Contribution

It introduces a relativistic quantum framework to calculate nonlinear absorption in plasma, accounting for polarization effects, which is novel compared to classical approaches.

Findings

Nonlinear absorption rate depends significantly on laser polarization.

Derived absorption rates for both classical and quantum plasma regimes.

Identified different behaviors of absorption in high-intensity x-ray laser interactions.

Abstract

On the base of the quantum kinetic equation for density matrix in plasma at the stimulated bremsstrahlung of electrons on ions, the nonlinear absorption rate for high-intensity shortwave radiation in plasma has been obtained within relativistic quantum theory. Both classical Maxwellian and degenerate quantum plasma are considered for x-ray lasers of high intensities. Essentially different dependences of nonlinear absorption rate on polarization of strong laser radiation is stated.