Heidelberg 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 53: Ultrashort Laser Pulses I
Q 53.3: Talk
Thursday, March 26, 2015, 11:30–11:45, K/HS2
High-order harmonic generation from ablated nanoparticle plasmas — •Michael Wöstmann1, Pavel Redkin2, Jiaan Zheng1, Henrik Witte1, Rashid Ganeev3, and Helmut Zacharias1 — 1Physikalisches Institut, Westfälische Wilhelms Universität, Deutschland — 2Smarkand State University, Usbekistan — 3Institute of ion-Plasma and Laser Physiks, Usbekistan
Plasmas from laser ablated nanoparticles and solid targets are used for high harmonic generation (HHG). These new materials potentially lead to increased efficiencies of the process as well as to higher cut-off energies. Some materials also show a single enhanced harmonic through Fano resonances in the recombination step. As source an amplified Ti:sapphire laser system with pulse durations of about 40 fs and pulse energies of up to 4 mJ at a repetition rate of 1 kHz is used. For the ablation a small part of the uncompressed radiation from the same laser is branched off. The delay between the pulses depends on the mass of the ablated material. HHG has been studied for Cu, Zn, Ag and carbon and silver. Comparative conversion efficiencies are presented for laser ablated carbon plasmas and gaseous argon plasmas.