Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Ultrakurze Laserpulse: Erzeugung 1
Q 14.2: Vortrag
Montag, 14. März 2011, 14:45–15:00, SCH 251
Development of a laser-based XUV source on the µJ level — •Wolfram Helml1, Gilad Marcus1, Laszlo Veisz1, Reinhard Kienberger2, and Ferenc Krausz1,3 — 1Max-Planck-Institut f. Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Deutschland — 2TU München, James-Franck-Str. 1, 85748 Garching, Deutschland — 3Ludwig-Maximilians-Universität München, 85748 Garching, Deutschland
High-harmonic generation has over the last decade been established as the method of choice to produce coherent XUV radiation with sub-femtosecond duration. One of the main issues that hinders the applicability of this technique to a large number of experiments, including for instance highly anticipated XUV pump - XUV probe measurements, is the relatively low efficiency of the process and subsequent low flux of the generated XUV photons.
We have built up an HHG beamline, based on a high-energy (100 mJ), ultrashort (∼8 fs) OPCPA system and a very long focal-length geometry, that allows us to fully exploit the power of the IR laser. We measured the resulting XUV intensity with a Zr-coated photo diode and demonstrate a flux of 1010 photons at an energy of 100 eV, corresponding to ∼2.24×10−4 mJ per pulse. First tests with a multiple-nozzle quasi-phase-matching scheme to further enhance the yield have been conducted and show very promising results to increase the XUV intensity above the µJ level.