Abstract
Sub-4-fs high harmonic pulses with photon energy of 27.9 eV were generated by using the 20-fs second harmonic pulses of Ti:sapphire laser, produced by the broadband- frequency conversion. The 27.9-eV pulses were fully characterized by the cross-correlation frequency resolved optical gating technique. A nonlinear optical process in the extreme ultraviolet (XUV) region, i.e. above-threshold ionization of helium atoms, by the high harmonic pulses was observed, demonstrating the high harmonic generation with high spatial and temporal coherence. This enables the autocorrelation measurement of attosecond pulses.KeywordsHelium AtomExtreme UltravioletSecond HarmonicShort Pulse DurationHigh Harmonic GenerationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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