Resonant parametric interference effect in spontaneous bremsstrahlung of an electron in the field of a nucleus and two pulsed laser waves

TL;DR

This paper theoretically investigates the resonant interference effects in spontaneous bremsstrahlung of electrons scattered by a nucleus within two pulsed laser fields, revealing conditions for significantly enhanced emission cross sections.

Contribution

It introduces a detailed analysis of the resonant parametric interference effect in spontaneous bremsstrahlung involving two pulsed laser waves, highlighting conditions for large cross section enhancements.

Findings

Resonant differential cross section can exceed non-field case by 4-5 orders of magnitude.

In the interference region, the cross section can be two orders of magnitude larger than in the Bunkin-Fedorov region.

Results are applicable for experimental verification at high-intensity laser facilities.

Abstract

Resonant spontaneous bremsstrahlung of an electron scattered by a nucleus in the field of two moderately strong pulsed laser waves is studied theoretically. The process is studied in detail within the interference kinematic region. This region is determined by scattering of particles in the same plane at predetermined angles, at that stimulated absorption and emission of photons of external pulsed waves by an electron occurs in correlated manner. The correspondence between the emission angle and the final-electron energy is established in the kinematic region where the resonant parametric interference effect is manifested. The resonant differential cross section of ENSB process with simultaneous registration of both emission angles of the spontaneous photon and the scattered electron, can exceed by 4-5 orders of magnitude the corresponding cross section in the absence of an external field. It was shown for nonrelativistic electrons that the resonant cross section of ENSB in the field of two pulsed laser waves within the interference region in two order of magnitude may exceed corresponding cross section in the Bunkin-Fedorov kinematic region. The obtained results may be experimentally verified, for example, by scientific facilities at sources of pulsed laser radiation (SLAC, FAIR, XFEL, ELI).