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  • Letter
  • Open Access

Hard x-ray intensity autocorrelation using direct two-photon absorption

Taito Osaka1,*, Ichiro Inoue1, Jumpei Yamada1, Yuichi Inubushi1,2, Shotaro Matsumura3, Yasuhisa Sano3, Kensuke Tono1,2, Kazuto Yamauchi3,4, Kenji Tamasaku1 et al.

Makina Yabashi1,2

  • 1RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
  • 2Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
  • 3Division of Precision Engineering and Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
  • 4Research Center for Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan

  • *osaka@spring8.or.jp
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Phys. Rev. Research 4, L012035 – Published 18 March, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L012035

Abstract

An intensity autocorrelation measurement is demonstrated to characterize a pulse duration of 9-keV x-ray free-electron laser (XFEL) pulses from a split-delay optical (SDO) system with four-bounce silicon 220 reflections in each branch. XFEL pulse replicas with variable time delays are generated by the SDO system itself. High intensity of >2×1016W/cm2 achieved in a self-seeding operation and careful data analysis allow the measurement with direct two-photon absorption. The autocorrelation trace gave a duration of 7.6±0.8fs in full width at half maximum for a Gaussian assumption. Furthermore, the trace shows good agreement with a simulation of the XFEL pulse shape propagating through the SDO system, irrespective of spectral chirps in the original XFEL pulses. Our results open the door toward direct temporal characterization of narrowband XFELs at the hard x-ray regime, such as self-seeded and future cavity-based XFELs, and indicate a solid way for temporal tailoring of ultrafast x-ray pulses with perfect crystals.

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Phys. Rev. Research 4, L012035– Published 18 March, 2022
  • Received 15 September 2020
  • Revised 27 January 2022
  • Accepted 9 February 2022
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