期刊
PHYSICS LETTERS B
卷 715, 期 1-3, 页码 246-250出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2012.07.040
关键词
Volkov solution; Nonlinear Breit-Wheeler process; Short laser pulse; Pair production
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 root s = 2m a similar enhancement of the pair production rate as for circular polarization. The strong enhancement below the weak-field threshold 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. (c) 2012 Elsevier B.V. All rights reserved.
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