Interferometric autocorrelation of an attosecond pulse train in the single-cycle regime

Yasuo Nabekawa, Toshihiko Shimizu, Tomoya Okino, Kentaro Furusawa, Hirokazu Hasegawa, Kaoru Yamanouchi, Katsumi Midorikawa

Research output: Contribution to journalArticlepeer-review

142 Citations (Scopus)

Abstract

We report on the direct observation of the phase locking of the attosecond pulse train (APT) via interferometric autocorrelation in the extreme ultraviolet region. APT is formed with Fourier synthesis of high-order harmonic fields of a femtosecond laser pulse. Time-of-flight mass spectra of N+, resulting from the Coulomb explosion of N2 absorbing two photons of APT, efficiently yield correlated signals of APT. The measured autocorrelation trace exhibits that the duration of the pulse should be only 1.3 periods of the extreme ultraviolet carrier frequency. A few interference fringes within the short pulse duration clearly show two types of symmetry, which ensure the phase locking between pulses in APT.

Original languageEnglish
Article number153904
JournalPhysical review letters
Volume97
Issue number15
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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