Time-frequency analysis of high-harmonic generation

de Morisson Faria, Carla F.; Do¨rr, Martin; Sandner, Wolfgang
July 2000
AIP Conference Proceedings;2000, Vol. 525 Issue 1, p349
Academic Journal
We review several studies on high-harmonic generation for one-dimensional model atoms subject to monochromatic and bichromatic driving fields, concentrating on how and which groups of harmonics can be influenced by strongly-coupled bound states or by a two-color driving field. We find that mainly low and threshold harmonics are influenced by the internal atomic structure, while a two-color driving field may influence groups of high harmonics. We compare different models for high-harmonic generation, such as the three-step model and the two-level atom, to the fully numerical solution of the time-dependent Schro¨dinger equation, investigating the models’ limitations and range of validity. While the three-step model yields a very good description of high harmonics, the two-level atom is not even adequate for describing low harmonics. © 2000 American Institute of Physics.


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