Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster Ultrakurze Laserpulse

Q 26.7: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C1

Supercontinuum generation in a photonic crystal fiber, characterization and transient absorption spectroscopy — •Jutta Mildner, Johannes Schneider, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Broadband ultrashort laserpulses are an important tool in ultrafast spectroscopy. Since Alfano and Shapiro generated the first supercontinua (SC) in diverse glass plates in 1970 [1], great interest and development has evolved on that subject. In this work, we present the setup of such a SC light source, its characterization and finally a first application. The SC are generated in a photonic crystal fiber being pumped by a common Ti:Sapphire femtosecond laser system in a setup analogous to [2]. The advantages of photonic crystal fibers lie in their high flexibility and low pump energies needed. The results of SC generation i.e. spectral properties and stability are discussed. Furthermore we present different approaches of SC pulse characterization containing autocorrelation, spectral interference and crosscorrelation techniques. Finally as an example of a first application of this light source, a transient absorption experiment of the laser dye DCM as a standard is conducted in a pump-SC probe setup. First results are shown.

[1] R.R. Alfano and S.L. Shapiro: PRL 24, 592 (1970)

[2] B.v. Vacano, W. Wohlleben and M. Motzkus: Opt. Lett. 31, 413 (2006)