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A: Atomphysik
A 15: Poster 2
A 15.17: Poster
Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3
Non-sequential double ionization with few-cycle laser pulses — •Xiaojun Liu1, E Eremina1, H Rottke1, W Sandner1, E Goulielmakis2, K O Keeffe2, M Lezius2, F Krausz2,3, F Lindner3, M Schätzel3, G.G Paulus3,4, and H Walther3 — 1Max-Born-Institut, Max-Born-Strasse 2a, D-12489 Berlin, Germany — 2Institut für Photonik, Technische Universität Wien, Gusshausstr. 27, A-1040 Wien, Austria — 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1,D-85748 Garching, Germany — 4Department of Physics, Texas A & M University, College Station, TX 77843-4242, USA
Few-cycle laser pulses have attracted much attention. In this short pulse regime, the so-called carrier-envelope (CE) phase, i.e., the phase difference between the carrier wave and pulse envelope, has considerable influence on strong-field phenomena, such as High Harmonic Generation (HHG) and Above Threshold Ionization (ATI). We report here experimental results on the influence of the CE phase on non-sequential double ionization (NSDI) of atoms in few-cycle laser pulses. Combining state-of-the-art phase-stabilized few-cycle lasers with ion momentum spectrometer, the momentum distribution of doubly charged argon ions is measured at different CE phases with 5 fs laser pulses at center wavelength of 760 nm. Depending on the CE phase, a prominent asymmetry in the momentum distribution of Ar2+ along laser polarization is observed, which is in strong contrast to the symmetry pattern observed in long pulses. It indicates a CE phase sensitivity of NSDI in few-cycle pulses. The strong dependence of the ion momentum distribution on the CE phase provides a sensitive tool for CE phase diagnosis.