Berlin 2014 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 2: Strahlungsquellen und deren Anwendungen - Attosekundenexperimente
K 2.6: Vortrag
Montag, 17. März 2014, 18:00–18:15, SPA SR203
High harmonics from a radio-frequency pre-excited medium — Enikoe Seres1,2, Jozsef Seres2, •Georg Winkler2, and Thorsten Schumm1,2 — 1Wolfgang Pauli Institute, CNRS UMI 2842, Vienna, Austria — 2Insitute of Atomic and Subatomic Physics, Vienna University of Technology, Vienna, Austria
To our knowledge, high harmonic generation is the only method, which can generate coherent VUV and EUV pulses at the 100 MHz repetition rate of frequency combs. However, Ti:sapphire frequency comb based HH sources suffer from the relatively low conversion efficiency of the process. This limitation originates from the high ionization potential of the gas, the ionization probability is very low. In VUV and EUV frequency combs, mainly Xe gas is used because it has the smallest ionization potential (12.1 eV) and so the highest laser-to- high harmonic conversion efficiency. However, this ionization potential of Xe is still too high, especially for a source in the VUV spectral range, where we aim to create a powerful HH source. Here we report the generation of high-order harmonics in Xe gas in the perturbative regime, which has been preexcited by radio-frequency discharge and pumped directly by the output of a Ti:sapphire frequency comb.