Pair production in short laser pulses near threshold
Pair production in short laser pulses near threshold
Nousch, T.; Seipt, D.; Kämpfer, B.; Titov, A. I.
The e+ e− pair production by a probe photon traversing a linearly polarized laser pulse is treated as generalized nonlinear Breit-Wheeler process. For short laser pulses with very few oscillations of the electromagnetic field we find below the perturbative weak-field threshold √s = 2m a similar enhancement of the pair production rate as for circular polarization. The strong subthreshold enhancement is traced back to the finite bandwidth of the laser pulse. A folding model is developed which accounts for the interplay of the frequency spectrum and the intensity distribution in the course of the pulse.
Keywords: pair production; Volkov states; short laser pulses; subthreshold
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Physics Letters B 715(2012)1-3, 246-250
DOI: 10.1016/j.physletb.2012.07.040
Cited 71 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17405