High-harmonic generation from hydrogen atoms driven by two-color mutually orthogonal laser fields
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 88, no 6, 063419- p.Article in journal (Refereed) Published
Calculations of high-harmonic spectra from hydrogen atoms driven by strong two-color orthogonal fields with wavelengths 800 and 400 nm are presented. The azimuthal symmetry of the electron dynamics is broken by the two-color orthogonal fields, and therefore the fully three-dimensional time-dependent Schrodinger equation is solved by using the generalized pseudospectral method. The cycle-averaged collision angles as a function of phase delay between the orthogonal fields are evaluated from the harmonic spectra. The results are in qualitative agreement with a recent experiment with helium atoms. Furthermore, the timing and direction of recollisions during the high-harmonic generation are analyzed in the time-frequency domain to extract electron trajectory information on subcycle time scales. Comparison with recent model calculations is also made.
Place, publisher, year, edition, pages
2013. Vol. 88, no 6, 063419- p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:su:diva-102500DOI: 10.1103/PhysRevA.88.063419ISI: 000332104300005OAI: oai:DiVA.org:su-102500DiVA: diva2:710404
U.S. Department of Energy; National Science Council of Taiwan; National Taiwan University 101R8700-2, 101R104021 2014-04-072014-04-072014-04-07Bibliographically approved