Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.51: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Efficiency of surface high harmonic radiation generated with a table-top terawatt laser — •Silvio Fuchs1,3, Christian Rödel1,3, Michael Behmke2, Erich Eckner1,3, Jana Bierbach1,3, Wolfgang Ziegler1,3, Oliver Jäckel1,3, Georg Pretzler2, and Gerhard Paulus1,3 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena — 2Institut für Laser- und Plasmaphysik, Heinrich-Heine Universität Düsseldorf — 3Helmholtz-Institut Jena
High harmonic radiation generated on solid surfaces is a promising source of intense XUV radiation. When terawatt laser pulses are focused with high temporal contrast on a glass target to relativistic intensities of 1019 W/cm2, the plasma-vacuum boundary and the electrons therein quiver due to the oscillating electric field of the driving laser pulse. The generated plasma oscillations cause two different generation mechanisms of surface high harmonics that contribute to the observed high harmonic spectra. We determined the efficiency of single high harmonic lines from laser-solid interaction as a function of the incident laser energy for the first time. The 17th harmonic, assigned to the CWE mechanism, has a pulse energy of ≈ 1−10 µ J. Relativistic surface harmonics (ROM) contain 100 nJ and 20 nJ for the 21st and 25th harmonic respectively. The conversion efficiency for CWE harmonics is 10−5. The relativistic harmonics have a conversion efficiency of 10−7 (21st) to 10−8(25th). A comparison with efficiencies that are obtained using Particle-In-Cell simulations shows good agreement for our experimental parameters.