Two-Photon Ionization of He through a Superposition of Higher Harmonics
Nektarios A. PapadogiannisFoundation for Research and Technology-Hellas, Institute of Electronic Structure & Laser, P.O. Box 1527, GR-711 10 Heraklion (Crete), GreeceL. A. A. NikolopoulosFoundation for Research and Technology-Hellas, Institute of Electronic Structure & Laser, P.O. Box 1527, GR-711 10 Heraklion (Crete), GreeceD. CharalambidisFoundation for Research and Technology-Hellas, Institute of Electronic Structure & Laser, P.O. Box 1527, GR-711 10 Heraklion (Crete), GreeceG. D. TsakirisMax Planck Institute of Quantum OpticsP. TzallasMax Planck Institute of Quantum OpticsK. WitteMax Planck Institute of Quantum Optics
2003en
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Annotatsiya
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 Schr\"odinger equation for He in a coherent polychromatic field, the ${\mathrm{H}\mathrm{e}}^{+}$ yield is calculated. From this yield the number of ${\mathrm{H}\mathrm{e}}^{+}$ 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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