Browsing by Author "Kretschmar, Martin"
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- ItemImpact of spatial inhomogeneities on on-axis pulse reconstruction in femtosecond filaments(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2014) Brée, Carsten; Kretschmar, Martin; Nagy, Tamas; Kurz, Heiko G.; Morgner, Uwe; Kovačev, MilutinWe demonstrate a strong influence of the spatial beam profile on the vacuum-propagated on-axis pulse shapes for a femtosecond filament in argon. The effects can be minimized by transmitting the filament into the far-field by a laser-drilled pinhole setup. Using this method, we can monitor the pulse compression dynamics along the entire longitudinal extension of the filament, including the ionization-induced plasma channel.
- ItemThin-disk laser-pumped OPCPA system delivering 4.4 TW few-cycle pulses(Washington, DC : Soc., 2020) Kretschmar, Martin; Tuemmler, Johannes; Schütte, Bernd; Hoffmann, Andreas; Senfftleben, Björn; Mero, Mark; Sauppe, Mario; Rupp, Daniela; Vrakking, Marc J.J.; Will, Ingo; Nagy, TamasWe present an optical parametric chirped pulse amplification (OPCPA) system delivering 4.4 TW pulses centered at 810 nm with a sub-9 fs duration and a carrier-envelope phase stability of 350 mrad. The OPCPA setup pumped by sub-10 ps pulses from two Yb:YAG thin-disk lasers at 100 Hz repetition rate is optimized for a high conversion-efficiency. The terawatt pulses of the OPCPA are utilized for generating intense extreme ultraviolet (XUV) pulses by high-order harmonic generation, achieving XUV pulse energies approaching the microjoule level. © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement