Interferometric Autocorrelation of an Attosecond Pulse Train in the Single-Cycle Regime

Yasuo Nabekawa, Toshihiko Shimizu, Tomoya Okino, Kentaro Furusawa, Hirokazu Hasegawa, Kaoru Yamanouchi, and Katsumi Midorikawa
Phys. Rev. Lett. 97, 153904 – Published 13 October 2006

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.

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  • Received 19 May 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.153904

©2006 American Physical Society

Authors & Affiliations

Yasuo Nabekawa1,*, Toshihiko Shimizu1, Tomoya Okino2,1, Kentaro Furusawa1, Hirokazu Hasegawa1, Kaoru Yamanouchi2,1, and Katsumi Midorikawa1

  • 1Laser Technology Laboratory, RIKEN, 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

  • *Electronic address: nabekawa@riken.jp

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Vol. 97, Iss. 15 — 13 October 2006

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