Finite size effects in stimulated laser pair production
2010 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 692, no 4, 250-256 p.Article in journal (Refereed) Published
We consider stimulated pair production employing strong-field QED in a high-intensity laser background. In an infinite plane wave, we show that light-cone quasi-momentum can only be transferred to the created pair as a multiple of the laser frequency, i.e. by a higher harmonic. This translates into discrete resonance conditions providing the support of the pair creation probability which becomes a delta-comb. These findings corroborate the usual interpretation of multi-photon production of pairs with an effective mass. In a pulse, the momentum transfer is continuous, leading to broadening of the resonances and subthreshold behaviour. The peaks remain visible as long as the number of cycles per pulse exceeds unity. The resonance patterns in pulses are analogous to those of a diffraction process based on interference of the produced pairs. We finally comment on the dependence of the peak positions, and in turn the effective mass, on the pulse shape.
Place, publisher, year, edition, pages
2010. Vol. 692, no 4, 250-256 p.
Pair production, strong-field QED, finite size effects
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:umu:diva-36584DOI: 10.1016/j.physletb.2010.07.044ISI: 000282249400006OAI: oai:DiVA.org:umu-36584DiVA: diva2:354812