Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Attosecond physics
A 5.6: Vortrag
Montag, 18. März 2013, 15:30–15:45, B 305
Phase-Matching Studies of High-Order Harmonic Generation from Water Droplets — •Heiko G. Kurz1,2, Daniel S. Steingrube1,2, 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 systematic investigations of frequency up-conversion into the extreme ultraviolet spectral domain. Two intense femtosecond laser pulses interact with a micrometer-sized liquid water droplet under vacuum conditions. Therein, high-order harmonic radiation of the fundamental frequency is generated (HHG) in a target with controllable density, reaching from liquid state to gaseous, and even the plasma state. We investigate how the density and the dynamics of a complex target influence the HHG yield. Harmonic radiation up to the 29th harmonic order is generated and a strong dependency of the harmonic yield on the spatio-temporal behaviour of the target is found. We detect only a small amount of incoherent radiation. The spatio-temporal dynamics of the droplet, such as the expansion of the droplet and plasma formation during interaction with intense laser pulses are controlled by variation of the intensity of the pump pulse and its influence onto HHG is observed.