Enhanced subthreshold electron-positron production in short laser pulses
A.I. Titov, H. Takabe, B.Kampfer, and A. Hosaka
TL;DR
This paper investigates how short laser pulses significantly enhance electron-positron pair production below the energy threshold, especially at moderate intensities, by analyzing the emission process in a polarized short-pulsed electromagnetic field.
Contribution
It demonstrates that decreasing laser pulse duration markedly increases subthreshold pair production cross sections, revealing a new effect in laser-matter interactions.
Findings
Total cross section increases with shorter pulse duration.
Subthreshold pair production is significantly enhanced in short pulses.
Moderate laser intensities still show notable effects.
Abstract
The emission of electron-positron pairs off a probe photon propagating through a polarized short-pulsed electromagnetic (e.g.\ laser) wave field is analyzed. A significant increase of the total cross section of pair production in the subthreshold region is found for decreasing laser pulse duration even in case of moderate laser pulse intensities.
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