Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field
Author(s) -
J. Tate,
T. Auguste,
H. G. Muller,
P. Salières,
Pierre Agostini,
Louis F. DiMauro
Publication year - 2007
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.98.013901
Subject(s) - physics , wave packet , lambda , scaling , atomic physics , electron , harmonics , high harmonic generation , helium , quantum mechanics , laser , geometry , mathematics , voltage
A theoretical investigation is presented that examines the wavelength scaling from near-visible (0.8 micro m) to midinfrared (2 micro m) of the photoelectron distribution and high harmonics generated by a "single" atom in an intense electromagnetic field. The calculations use a numerical solution of the time-dependent Schrödinger equation (TDSE) in argon and the strong-field approximation in helium. The scaling of electron energies (lambda2), harmonic cutoff (lambda2), and attochirp (lambda -1) agree with classical mechanics, but it is found that, surprisingly, the harmonic yield follows a lambda -(5-6) scaling at constant intensity. In addition, the TDSE results reveal an unexpected contribution from higher-order returns of the rescattering electron wave packet.
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