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Central frequency of few-cycle laser pulses in strong-field processes

TitleCentral frequency of few-cycle laser pulses in strong-field processes
Publication TypeJournal Article
Year of Publication2018
AuthorsVenzke, J, Joyce, T, Xue, Z, Becker, A, Jaron-Becker, A
JournalPhysical Review A
Volume98
Issue6
Date Published2018-12
ISSN2469-9926
Keywordselectric field, excitation, frequency
Abstract

We analyze the role of the difference between the central frequencies of the spectral distributions of the vector potential and the electric field of a short laser pulse. The frequency shift arises when the electric field is determined as the derivative of the vector potential to ensure that both quantities vanish at the beginning and end of the pulse. We derive an analytical estimate of the frequency shift and show how it affects various light induced processes, such as excitation, ionization, and high-harmonic generation. Since observables depend on the frequency spectrum of the electric field, the shift should be taken into account when setting the central frequency of the vector potential to avoid potential misinterpretation of numerical results for processes induced by few-cycle pulses.

URLhttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.98.063409
DOI10.1103/PhysRevA.98.063409

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