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Phys Rev Lett. 2003 Apr 4;90(13):133902. Epub 2003 Apr 4.

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

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Foundation for Research and Technology-Hellas, Institute of Electronic Structure & Laser, GR-711 10 Heraklion (Crete), Greece.


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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