Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.11: Poster
Montag, 14. März 2011, 16:30–19:30, P1
A high repetition rate High Harmonic Generation source for coherent XUV microscopy and electron spectroscopy — •Jürgen Schmidt1, Christian Späth1, Michael Hofstetter2, Soo Hoon Chew1, Alexander Guggenmos2, Mihael Kranjec1, and Ulf Kleineberg1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Laser driven high harmonic sources have established as versatile instruments for fundamental research in the EUV, XUV and SXR wavelength range. Due to their outstanding properties like coherence, the possibility of locking them to the driving laser pulse and of generating sub-fs pulses, they are inevitable for ultrafast pump-probe experiments and improved applications such as the lens-less coherent diffraction imaging XUV microscopy. In our setup we seeded, to our knowledge for the first time, a HHG gas source with a 10 kHz repetition rate Ti:Sa laser system with pulses of 5 fs duration and 0.2 mJ energy. Having high rep rates in the harmonics is very desirable regarding integration time e.g. for scanning microscopic schemes or often even indispensible for detector types which barely can handle multi-hit events, e.g. delay-line detectors. Experiments and applications relying on those detectors/schemes could only poorly performed so far with today's available HHG sources at repetition rates below 1 kHz. We characterized the harmonic output of our system by means of a XUV flat field spectrometer and tested its potential and limits with respect to harmonic selectivity, energy-range/cut-off tunability and conversion efficiency.