Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 42: Poster: Attosecond physics
A 42.2: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Spatial contribution of electron trajectories to HHG in a semi-infinite gas cell — •Martin Kretschmar1,2, Carlos-Hernandes Garcia3, Daniel S. Steingrube1,2, Luis Plaja3, Uwe Morgner1,2, and Milutin Kovacev1,2 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, D-30167 Hannover, Germany — 2QUEST, Centre for Quantum Engineering and Space-Time Research, Welfengarten 1, D-30167 Hannover, Germany — 3Grupo de Investigacion en Optica Extrema, Universidad de Salamanca, E-37008 Salamanca, Spain
We present an analysis of the spatial beam profile of high-order harmonic radiation generated in xenon in a semi-infinite gas cell (SIGC). The observed spatial profiles consist of a central, less divergent part surrounded by a conical structure. We were able to assign contributions of two electron trajectories to different regions of the beam by experimental observations as well as simulations. Furthermore we examine the influence of phase-matching parameters, such as the focusing position inside the SIGC and the pressure of the generating medium on the different electron trajectory contributions and their spatial separation. Simulations, based on the discrete dipole approximation, confirm the experimental observations and give further insight on the generation process.