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P: Plasmaphysik

P 9: Dense Plasmas and Plasma Diagnostic (Poster Session)

P 9.12: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT2

High Order Harmonic Generation from Solids: Comparison of Experimental and Numerical Results — •Clemens Dietrich, Alexander Tarasevitch, Christian Blome, and Dietrich von der Linde — Institut für Laser- und Plasmaphysik, Universität Essen, Universitätsstr. 5, 45117 Essen, Germany

It is well known that the interaction of an intense femtosecond laser pulse with a solid surface is accompanied by the generation of optical harmonics of high order. We performed experiments using high contrast laser pulses of 120 fs duration and energy up to 150 mJ from a 10 Hz titanium sapphire system. The harmonics were emitted in a well collimated beam. Harmonics up to the 17th order were readily recorded in a single shot. Using a controllable pre-pulse we changed the plasma scale length and found a dramatic decrease in the harmonic efficiency. Measured harmonic efficiency and its dependency upon the plasma scale length are inconsistent with available 1D PIC simulations. To investigate this point, we are using the fully relativistic 1D PIC code LPIC++ [1].
: Robert E.W. Pfund and Roland Lichters, Max-Planck-Institut für   Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching,
   Germany