Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 16: Nichtlineare Optik 2
Q 16.7: Vortrag
Montag, 24. März 2003, 18:00–18:15, F142
XUV Fourier-transform spectroscopy with high order harmonics — •Milutin Kovacev1, Enrico Priori2, Yann Mairesse1, Hamed Merdji1, Patrick Monchicourt1, Johan Norin3, Anders Person3, Anne L’Huillier3, Claes-Goran Wahlstrom3, Sergey Fomichev4, Bertrand Carre1, and Pascal Salieres1 — 1CEA-SPAM, Gif-sur-Yvette Cedex, France — 2Polytechnico, Milan, Italy — 3Laser Center, Lund, Sweden — 4Kurchatov Institute, Moscow, Russia
We have developed a new interferometric autocorrelation technique in order to study the properties of harmonic generation in the XUV spectral range. A high order autocorrelation of laser pulses is performed using two time-delayed spatially-superposed laser pulses which generate high order harmonics in a gas jet. We show an evolution to a first-order (field) autocorrelation of the harmonics by spatially separating the two laser beams, thus producing two independent phase-locked harmonic beams that overlap and interfere in the far field. We have also simulated these interferometric traces by calculating both the single-atom response and the effect of beam propagation. Our measurements demonstrate the precise control of the relative phase of individual harmonic pulses with an accuracy on an attosecond time scale. Moreover we demonstrate a first order autocorrelation on high-order harmonics without relying on beam optics in the XUV. This demonstrates the feasibility of XUV Fourier-transform spectroscopy and opens a wide range of applications.