Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Photonik 4
Q 66.3: Talk
Friday, March 16, 2012, 14:30–14:45, V38.01
Single pass high harmonic generation with 515 nm pulses at 50 MHz repetition rate — Waldemar Schneider1, Lauryna Lötscher1, Sarah Stebbings1, Andreas Vernaleken1, Thomas Udem1, Theodor Hänsch1, Peter Rußbüldt2, Dieter Hoffmann2, Alexander Apolonsky1, •Matthias Kling1, and Ferenc Krausz1 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Fraunhofer-Institut für Lasertechnik, Aachen
Femtosecond MHz-repetition rate extreme-ultraviolet (EUV) laser sources are highly desirable for high-resolution and time-resolved spectroscopies. High harmonic generation (HHG) from intense driving laser in gaseous media requires peak-intensities on the order of 1013 W/cm2. Typically HHG at MHz repetition rates demands cavity-assisted or plasmonic field enhancement. Meanwhile, owing to the progress in the development of solid state amplifier systems for ultra-short pulses, HHG at MHz repetition rate also became possible with comparably simple single pass geometry. Here, we report on single pass HHG with amplified and frequency doubled (515 nm) pulses at 50 MHz repetition rate using an Yb:YAG Innoslab amplifier providing 600 fs pulses with 250 W average power. By focusing into a xenon gas jet we detect high harmonic radiation up to 73.5 nm. Combined with potential optimizations such as phase-matching of the HHG process, nonlinear pulse compression and near-field enhancement by nanoparticles these results show that state-of-the-art amplifier systems became a promising source for HHG at multi-MHz repetition rates.