Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 47: Attosecond physics
A 47.3: Vortrag
Donnerstag, 20. März 2014, 17:00–17:15, BEBEL E42
High-Order Harmonic Spectroscopy with Water Droplets — •Heiko G. Kurz1,2, Martin Kretschmar1,2, Tamas Nagy1, Detlev Ristau1,2,3, 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 report on high-order harmonic generation (HHG) from dense water droplets, where two intense femtosecond laser pulses interact with a micrometer-sized liquid water droplet under vacuum conditions. The first pulse expands the droplet, which performs a transition from the liquid phase into the gas phase. The second pulse is used for HHG, where different density states become accessible by controlling the delay between the two pulses. Information about the density evolution of the target is probed in-situ with the harmonic radiation, and two density regimes can be determined. The first at low density, where the harmonic yield develops according to the phase-matching conditions and a second, where the density of the target is too high and the electronic trajectories are perturbed during their excursion in the continuum by neighboring particles. By controlling the density of the target via the delay, the transition between these two density regimes is observed.