Konstanz 1998 – scientific programme

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SYB: Symposium Wechselwirkung intensiver Lichtfelder mit Materie

SYB 1: Nichtlineare Prozesse hoher Ordnung

SYB 1.2: Talk

Monday, March 16, 1998, 16:15–16:30, A702

Spectral and time-frequency analysis of the bound state and continuum contributions to harmonic generation — •C. Figueira de Morisson Faria, M. Dörr, and W. Sandner — Max-Born-Institut, Rudower Chaussee 6, 12474 Berlin

We investigate the harmonic generation process in model atoms with several bound states. Results from the numerical time-dependent solution of the Schrödinger equation for a 1-D model are compared with a two-step approach [1]. Using a time-frequency analysis, the semiclassical return times are recovered for the high-plateau and cutoff spectral regions [2]. Performing time-dependent projections onto the field-free bound-state basis, and using Fourier and Wavelet analysis, we also investigate whether harmonic generation is mainly a result of bound-free transitions. The bound-bound contributions are compared with the results from a two-level atom [3], and the influence of ionization in this latter model is investigated [4].

[1] M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier and P. B. Corkum, Phys. Rev. A 49, 2117 (1994)

[2] C. Figueira de Morisson Faria, M. Dörr and W. Sandner, Phys. Rev. A 55, 3961 (1997)

[3] C. Figueira de Morisson Faria, M. Dörr, and W. Sandner, in preparation

[4] E. Conejero Jarque and L. Plaja, J. Opt. Soc. Am. B 13 (1996)