Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.59: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Resonantly enhanced high-order harmonic generation in plasmas. — •Michael Wöstmann1, Henrik Witte1, Helmut Zacharias1, and Rashid Ganeev21Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Institute of Ion-Plasma and Laser Technologies, Tashkent 100125, Uzbekistan

Results from high-harmonic generation from laser ablated plasmas from different materials are presented. These include materials that show resonant enhancement of a certain harmonic. An amplified Ti:sapphire laser system with pulse durations of about 40 fs and pulse energies of up to 5 mJ at a repetition rate of 1 kHz is used for harmonic generation. The plasma is generated by part of the uncompressed radiation from the same laser focused onto a rotating solid state target. Additionally, the compressed pulse has been applied for plasma generation as well. In both cases the delay between the plasma generating pulse and the high harmonic generating pulse was investigated dependent on the material used. Altogether eight different target materials have been studied, namely Al, C, Ag, In, Sn, Cu, Zn and brass. Studies include the development of the harmonics intensity on the polarization of the driving laser, the tuning of the fundamental wavelength, especially in presence of a resonantly enhanced harmonic, and the application of an alloy in comparison to the pure materials.

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