Darmstadt 2008 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 3: Attosekundenpulse und höhere Harmonische (gemeinsam mit A und Q)

K 3.6: Vortrag

Montag, 10. März 2008, 18:00–18:15, 3C

Enhancement of high-order harmonic generation by rare gas mixtures — •Mirko Prijatelj, Tobias Vockerodt, Daniel Steingrube, Uwe Morgner, and Milutin Kovacev — Institut für Quantenoptik, Leibniz Universität Hannover

We study the enhancement of high-order harmonic generation (HHG) by rare gas mixtures. Our experiment confirms recent results mixing He and Xe atoms. The harmonics from Xe atoms enhance the observed yield from He atoms by about two orders of magnitude. Moreover the cut-off position is extended compared to the spectrum of pure He atoms. We report on the experimental parameter sensitivity of the enhancement process and show first results which indicate that the atomic state structure is an important prerequisite. Our investigation extends as well towards experimental conditions suited for low-energy pump pulses as for example mode-locked Ti:sapphire femtosecond oscillator pulses with MHz repetition rates. These conditions are interesting for generating harmonics either intracavity or directly from a femtosecond oscillator. This experimental approach promises to lead to a joint frontier of precision spectroscopy and ultrafast science by extending frequency comb technology into the XUV spectral region.