Phys. Rev. Lett. 96, 083901 (2006) [4 pages]Conclusive Evidence of an Attosecond Pulse Train Observed with the Mode-Resolved Autocorrelation TechniqueReceived 16 November 2005; published 27 February 2006 We report on the direct observation of an attosecond pulse train with a mode-resolved autocorrelation technique. The chirp among the three harmonic fields is specified by analyzing two-photon above-threshold ionization spectra of electrons, resulting in a pulse duration that should be shorter than 450 as, which is, to our knowledge, the first determination of the chirp in the attosecond pulse train with an autocorrelation technique. These results will open the way to full characterization of an attosecond pulse train with its envelope. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.083901
DOI:
10.1103/PhysRevLett.96.083901
PACS:
42.65.Re, 32.80.Fb, 42.65.Ky
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