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Theory of high-harmonic generation by low-frequency laser fields

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1103/PhysRevA.49.2117
AuteurRechercher : ; Rechercher : ; Rechercher : 1; Rechercher : ; Rechercher : 1
Affiliation du nom
  1. Conseil national de recherches du Canada
FormatTexte, Article
Sujetatomic physics; diffusion; electrons; electron energy levels; electron scattering; electron transitions; harmonic analysis; harmonic generation; laser beams; light polarization; mathematical models; atomic dipole matrix elements; atomic potentials; Floquet equations; ground state; ionization energy; low frequency laser fields; ponderomotive energy; quantum tunneling; saddle point method; Schrodinger equations; quantum theory
Résumé
We present a simple, analytic, and fully quantum theory of high-harmonic generation by low-frequency laser fields. The theory recovers the classical interpretation of Kulander et al. in Proceedings of the SILAP III Works hop, edited by B. Piraux (Plenum, New York, 1993) and Corkum [Phys. Rev. Lett. 71, 1994 (1993)] and clearly explains why the single-atom harmonic-generation spectra fall off at an energy approximately equal to the ionization energy plus about three times the oscillation energy of a free electron in the field. The theory is valid for arbitrary atomic potentials and can be generalized to describe laser fields of arbitrary ellipticity and spectrum. We discuss the role of atomic dipole matrix elements, electron rescattering processes, and of depletion of the ground state. We present the exact quantum-mechanical formula for the harmonic cutoff that differs from the phenomenological law Ip+3.17Up, where Ip is the atomic ionization potential and Up is the ponderomotive energy, due to the account for quantum tunneling and diffusion effects.
Date de publication
Dans
  • Physical Review A 49, nº 3 : 2117–2132.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21276178
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Identificateur de l’enregistrement3fbd2f69-9a2d-4be9-af33-006ebb8003d2
Enregistrement créé2015-09-28
Enregistrement modifié2020-04-27
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