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13 March 2007 Direct temporal characterization of attosecond pulse trains
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We report the direct observation of a train of attosecond pulses by mean of autocorrelation method using nonresonant two photon processes in atoms and molecules in the xuv region. By analyzing the photoelectron spectra produced by two-photon above-threshold ionization in Ar, the chirp in the attosecond pulse train on the top of the pulse duration of 450 atttoseconds was determined. We also succeeded in observing interferometric fringes on the autocorrelation trace and reconstructed the electric field inside of attosecond pulses with ion signals produced by molecular Coulomb explosion.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshihiko Shimizu, Tomoya Okino, Kaoru Yamanouchi, Yasuo Nabekawa, and Katsumi Midorikawa "Direct temporal characterization of attosecond pulse trains", Proc. SPIE 6460, Commercial and Biomedical Applications of Ultrafast Lasers VII, 64600Q (13 March 2007);


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