Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster III
Q 55.43: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 8 Foyer
Phase-matching of high-order harmonic generation in a semi-infinite gas cell geometry — •Daniel Sebastian Steingrube1,2, Tobias Vockerodt1,2, Uwe Morgner1,2, and Milutin Kovacev1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany — 2QUEST, Centre for Quantum Engineering and Space-Time Research
We study high-order harmonic generation (HHG) by rare gases and their mixture in a semi-infinite gas cell geometry. Our experiment confirms recent results by Takahashi et. al. [PRL 99, 053904 (2007)] of enhanced HHG in gas mixtures. The harmonics from Xenon atoms enhance the observed yield from Helium atoms by about two orders of magnitude.
The emphasis of our studies places on short focal lengths. The enhancement effect and the phase matching conditions are investigated in detail at different focusing. A systematic study on the experimental phase matching conditions is performed which includes mixing ratios and the focusing position dependence. Using the experimental parameter maps optimal conditions for the enhancement process are found.
Our study of the enhancement effect extends towards experimental conditions suited for low-energy pump pulses at high repetition rates. Especially, the enhancement effect at short focal lengths promises to lead to a joint frontier of precision spectroscopy and ultrafast science.