Two-Photon Ionization of He through a Superposition of Higher Harmonics

N. A. Papadogiannis, L. A. A. Nikolopoulos, D. Charalambidis, G. D. Tsakiris, P. Tzallas, and K. Witte
Phys. Rev. Lett. 90, 133902 – Published 4 April 2003

Abstract

We present experimental results and theoretical analysis of two-photon ionization of He by a superposition of the 7th to the 13th harmonic of a Ti:sapphire laser. Solving the time-dependent Schrödinger equation for He in a coherent polychromatic field, the He+ yield is calculated. From this yield the number of He+ ions produced has been estimated and found in reasonable agreement with its measured value. The present results establish the feasibility of a second-order autocorrelation measurement of superposition of harmonics, and thus they represent the precursor towards the direct temporal characterization of attosecond pulse trains.

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  • Received 3 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.133902

©2003 American Physical Society

Authors & Affiliations

N. A. Papadogiannis1,2, L. A. A. Nikolopoulos1, and D. Charalambidis1,2

  • 1Foundation for Research and Technology-Hellas, Institute of Electronic Structure & Laser, P.O. Box 1527, GR-711 10 Heraklion (Crete), Greece
  • 2University of Crete, Heraklion (Crete), Greece

G. D. Tsakiris, P. Tzallas, and K. Witte

  • Max Planck Institut für Quantenoptik, D-85748 Garching, Germany

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Issue

Vol. 90, Iss. 13 — 4 April 2003

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