Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 16: Wechselwirkung mit starken Laserpulsen I
A 16.7: Vortrag
Donnerstag, 16. März 2006, 12:10–12:25, H6
Controlling high-harmonic generation and above-threshold with an attosecond-pulse train — •Carla Figueira de Morisson Faria1, Pascal Salieres2, Pierre Villain2, and Maciej Lewenstein3,4 — 1Centre for Mathematical Science, City University, London EC1V OHB, United Kingdom — 2Groupe Attophysique, CEA-SPAM, Bât. 522, Centre d’Etudes de Saclay, F- 91191 Gif-sur -Yvette, France — 3ICFO, Institut de Ciències Fotòniques, E-08860 Castelldefels (Barcelona), Spain — 4Institut für theoretische Physik, Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany
We perform a detailed analysis of how high-order harmonic generation (HHG) and above-threshold ionization (ATI) can be controlled by an attosecond-pulse train superposed to a strong, near-infrared laser field, and exhibiting a time delay with respect to it. In particular we show that the high-harmonic and photoelectron intensities, the high-harmonic plateau structure and cutoff energies, and the ATI angular distributions can be manipulated by changing this delay. This is a direct consequence of the fact that the attosecond pulse train can be employed as a tool for constraining the instant an electronic wave packet is ejected in the continuum. A change in such initial conditions strongly affects its subsequent motion in the laser field, and thus HHG and ATI. In our studies, we employ the Strong-Field Approximation and explain the features observed in terms of interference effects between various electron quantum orbits. Such results are in very good agreement with results obtained from the numerical solution of the time dependent Schrödinger equation, or observed in experiments.