Conclusive Evidence of an Attosecond Pulse Train Observed with the Mode-Resolved Autocorrelation Technique

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Yasuo Nabekawa,¹ Toshihiko Shimizu,¹ Tomoya Okino,^2,1 Kentaro Furusawa,¹ Hirokazu Hasegawa,¹ Kaoru Yamanouchi,^2,1 and Katsumi Midorikawa¹
¹RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
²Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan

Received 16 November 2005; published 27 February 2006

Wereport on the direct observation of an attosecond pulse trainwith a mode-resolved autocorrelation technique. The chirp among the threeharmonic fields is specified by analyzing two-photon above-threshold ionization spectraof electrons, resulting in a pulse duration that should beshorter than 450 as, which is, to our knowledge, the firstdetermination of the chirp in the attosecond pulse train withan autocorrelation technique. These results will open the way tofull characterization of an attosecond pulse train with its envelope.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.083901
DOI:	10.1103/PhysRevLett.96.083901
PACS:	42.65.Re; 32.80.Gc; 42.65.Ky 42.65.Re Ultrafast processes; optical pulse generation and pulse compression 32.80.Gc Photodetachment of atomic negative ions 42.65.Ky Optical frequency conversion; optical harmonic generation, including higher-order harmonic generation YEAR: 2006
KEYWORDS:	two-photon processes, photoionisation, high-speed optical techniques, xenon