München 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
K: Fachverband Kurzzeit- und angewandte Laserphysik
K 5: Laser-Mater-Interaction
K 5.2: Vortrag
Dienstag, 19. März 2019, 17:50–18:10, HS 3
Two-color spectral broadening in hollow fiber compressor — •Igor Tyulnev1,2,3, Lu Wang1,2,3, Yudong Yang1,2,3,4, and Franz Kärtner1,2,3,4 — 1Center for Free- Electron Laser Science CFEL, Notkestraße 85, 22607 Hamburg, Germany — 2Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — 3Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 4The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
Isolated attosecond pulses are important tools for optical pump - XUV probe experiments, with resolution down to the time scale of electron dynamics. Generation of these few-cycle, if not sub-cycle, laser pulses requires an ultra-broad bandwidth. To create the required ultra-broadband spectrum, we co-propagated an ultrashort pulse and it*s delayed second harmonic through a noble gas filled hollow core fiber. A thorough simulation of the pulses* behavior inside the fiber has been established. The calculations include the effects of group velocity dispersion, self-phase-modulation (SPM), self-steepening and cross-phase modulation (XPM). In addition, the ADK model is used to calculate laser induced ionization to first order. We find that the time delay between the two colors has a strong influence on the broadening of the spectrum and is therefore crucial to minimize the potential pulse duration after compression. We present the results of our two-color setup and simulated spectra with different time delays.