Laser-assisted bremsstrahlung for circular and linear polarization

Stephan Schnez, Erik Lötstedt, U. Jentschura, Christoph H. Keitel

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We numerically evaluate the cross sections for spontaneous bremsstrahlung emission in a laser field for both circular and linear laser polarization, in a regime where the classical ponderomotive energies for the considered laser intensities are considerably larger than the rest mass of the electron. A fully relativistic quantum-electrodynamic approach using the Volkov solutions of an electron in an external field and Dirac-Volkov propagators for the intermediate electrons is applied. We compare circular to linear polarization and point out several interesting features of the laser-dressed cross sections. Regularizations in both electron and photon propagators are required. Specifically, imaginary mass and energy shifts of the electron must be implemented near resonances which correspond to Doppler-shifted harmonics of the laser frequency. We also introduce a screening to the Coulomb potential in order to avoid long-range Coulomb infinities at zero momentum transfer.

Original languageEnglish
Article number053412
JournalPhysical Review A
Volume75
Issue number5
DOIs
Publication statusPublished - May 18 2007

Fingerprint

circular polarization
linear polarization
bremsstrahlung
lasers
electrons
propagation
cross sections
Coulomb potential
quantum electrodynamics
infinity
momentum transfer
screening
harmonics
energy
shift
photons
polarization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Laser-assisted bremsstrahlung for circular and linear polarization. / Schnez, Stephan; Lötstedt, Erik; Jentschura, U.; Keitel, Christoph H.

In: Physical Review A, Vol. 75, No. 5, 053412, 18.05.2007.

Research output: Contribution to journalArticle

Schnez, Stephan ; Lötstedt, Erik ; Jentschura, U. ; Keitel, Christoph H. / Laser-assisted bremsstrahlung for circular and linear polarization. In: Physical Review A. 2007 ; Vol. 75, No. 5.
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