Laser pulse-length effects in trident pair production


Laser pulse-length effects in trident pair production

Hernandez Acosta, U.; Kämpfer, B.

Laser pulses facilitate multiphoton contributions to the trident pair production e_L^- \to e_L^- + e_L^+ + e_L^-, where the label L indicates a laser field dressed electron (e^-) or positron (e^+ ). We isolate the impact of the pulse envelope in the trident S matrix element, formulated within the Furry picture, in leading order of a series expansion in the classical non-linearity parameter a_0. Generally, the Fourier transform of the envelope carries the information on the pulse length, which becomes an easily tractable function in the case of a cos^2 pulse envelope. The transition to a monochromatic laser wave can be handled in a transparent manner, as also the onset of multiphoton effects for short pulses can be factorized out and studied separately.

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Publ.-Id: 28792