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A: Fachverband Atomphysik

A 31: Attosecond physics

A 31.3: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

A Figure of Merit for Ionization during HHG — •Heiko G. Kurz^1,2, Martin Kretschmar^1,2, Tamas Nagy¹, Detlev Ristau^1,2,3, Manfred Lein^2,4, Uwe Morgner^1,2,3, and Milutin Kovacev^1,2 — 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 study the impact of an ionized background medium onto HHG in an in-situ pump-probe experiment by using high-density liquid water droplets as a target. By increasing the intensity of the pump pulse, ionization within the target is enhanced. A second, time-delayed probe pulse is used to generate harmonic radiation. A medium consisting of ions which surround the electron-ion couple during HHG therein can critically influence the electronic trajectories along their excursion in the continuum since the ionic Coulomb field may deflect the electron in a way, that the recombination process is inhibited. In combination with numerical simulations, our measurements allow us to develop a figure of merit for ionization within the macroscopic target.