Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 24: Attosecond physics I

A 24.4: Talk

Thursday, March 17, 2011, 17:15–17:30, BAR 205

Interference of two attosecond pulses in the process of ionization gating — •Christian Ott, Philipp Raith, Michael Schönwald, Andreas Kaldun, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

High-order harmonics are generated in neon using few-cycle (∼6 fs) carrier-envelope-phase(CEP)-stabilized laser pulses from a commercial TiSa laser amplifier in the 10¹⁴ W/cm² intensity regime. Exploiting spatio-temporally designed phasematching conditions resulting in ionization gating on the leading edge of the driving laser pulse, interference patterns of few (predominantly two) attosecond pulses in the 70 to 100 eV XUV spectral range have been experimentally observed in our lab at MPIK. The CEP dependence of these interference patterns will be presented, analyzed and compared to the theoretically expected phasematching response of coherently driven macroscopic media in the ionization gating regime. The results demonstrate the possibility to use collective coherence properties of a nonlinear medium towards attosecond pulse shape control.