Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Ultrakurze Laserpulse: Anwendungen 1
Q 22.8: Vortrag
Dienstag, 15. März 2011, 12:15–12:30, SCH A01
Ultra-broadband third-harmonic generation in fs-filamentation — •Tobias Vockerodt1,3, Daniel Steingrube1,3, Emilia Schulz1,3, Milutin Kovačev1,3, and Uwe Morgner1,2,3 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2Laserzentrum Hannover e.V. — 3QUEST Centre for Quantum Engineering and Space-Time Research, Hannover
Optical filamentation is a scheme often used for supercontinuum generation of short laser pulses as an alternative to gas filled hollow-core fibres. Filaments are well studied with respect to temporal and spectral evolution in the visible and infrared region. However, little attention has been given to the ultraviolet (UV) parts of the spectrum.
In this work, we present our studies of UV and third harmonic generation within a filament generated by a 35 fs, 800 nm laser pulse in argon. The filament is probed along its length by establishing an abrupt transition to vacuum by a pinhole. Amongst broadening of the fundamental pulse spectrum throughout the visible and near infrared, third harmonic (TH) generation extends the spectrum into the UV. The unperturbed filament emits TH off-axis on a cone around the filament core. However, if the filament is truncated, the TH conversion efficiency on-axis increases significantly and the TH spectrum broadens. The central part contains pulse energy of up to one microjoule, opening prospects for strong few-cycle-pulses in the UV.