Laser-assisted bremsstrahlung for circular and linear polarization

Journal Article · Tue May 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.053412· OSTI ID:20982554

Schnez, Stephan; Loetstedt, Erik; Jentschura, Ulrich D; Keitel, Christoph H ^[1]

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1. Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany)

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.

• OSTI ID: 20982554
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BREMSSTRAHLUNG
COMPARATIVE EVALUATIONS
COULOMB FIELD
CROSS SECTIONS
DOPPLER EFFECT
ELECTRONS
EMISSION
FREE ELECTRON LASERS
HARMONICS
LASER RADIATION
MATHEMATICAL SOLUTIONS
MOMENTUM TRANSFER
PHOTONS
POLARIZATION
PONDEROMOTIVE FORCE
QUANTUM ELECTRODYNAMICS
RELATIVISTIC RANGE
RESONANCE
REST MASS
SCREENING