Subthreshold pair production in short laser pulses

Subthreshold pair production in short laser pulses

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 \(\sqrt{s} = 2m\)...

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Veröffentlicht in:arXiv.org 2012-06
Hauptverfasser: Nousch, T, Seipt, D, Kampfer, B, Titov, A I
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Sprache:eng
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Circular polarization
Electromagnetic fields
Frequency spectrum
Lasers
Linear polarization
Pair production
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Seipt, D
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Titov, A I
description 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 \(\sqrt{s} = 2m\) 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.
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subjects Circular polarization
Electromagnetic fields
Frequency spectrum
Lasers
Linear polarization
Pair production
title Subthreshold pair production in short laser pulses
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