Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 42: Poster: Attosecond physics
A 42.3: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Yield-Control of High-Order Harmonic Generation from Water Droplets — Heiko G. Kurz1,2, •Melanie Barth1, Martin Kretschmar1,2, Tamas Nagy1, Daniel S. Steingrube1,2, Detlev Ristau3, Manfred Lein2,4, Uwe Morgner1,2,3, and Milutin Kovacev1,2 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, Hannover — 2QUEST, Centre for Quantum Engineering and Space-Time Research, Welfengarten 1, Hannover — 3Laser Zentrum Hannover e.V., Hollerithallee 8, Hannover — 4Leibniz Universität Hannover, Institut für theoretische Physik, Appelstrasse 2, Hannover
We use a pump-probe setup in order to investigate the properties of high-order harmonic radiation generated from liquid water droplets. Using a commercial CPA-laser system, the influence of the time delay onto the emission of harmonic radiation is systematically studied and optimum parameters for the conversion process are determined. We control the spatiotemporal dynamics of the droplet, such as the expansion of the droplet and plasma formation during interaction with intense laser pulses by variation of the intensity of the pump pulse and observe its influence onto high-order harmonic generation (HHG). Moreover, the coherent build-up of the generated radiation field (Phase-matching) is studied by controlling the focal position and the intensity of the probe pulse. We find transient phase-matching conditions and the spatio-temporal dynamics of the target to be of major influence on the harmonic yield. The experiments represent a fundamental analysis of phase matching during HHG from liquid droplets.