• High Power Laser Science and Engineering
  • Vol. 4, Issue 2, 02000e18 (2016)
Ryuji Itakura1、†, Takayuki Kumada2, Motoyoshi Nakano3, and Hiroshi Akagi1
Author Affiliations
  • 1Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai Kizugawa, Kyoto 619-0215, Japan
  • 2Nuclear Science and Research Institute, Japan Atomic Energy Agency, 2-4 Shirakata Tokai, Ibaraki 319-1195, Japan
  • 3Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aoba Aoba-ku, Sendai 980-8578, Japan
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    Abstract

    We demonstrate that the methodology of frequency-resolved optical gating (FROG) is applicable to time-resolved reflection spectroscopy of a plasma mirror in the vacuum-ultraviolet (VUV) region. Our recent study [R. Itakura et al. Opt. Express 23, 10914 (2015)] has shown that a VUV waveform can be retrieved from a VUV reflection spectrogram of a plasma mirror formed on a fused silica (FS) surface by irradiation with an intense femtosecond laser pulse. Simultaneously, the increase in the reflectivity with respect to the Fresnel reflection of the unexcited FS surface can be obtained as a time-dependent reflectivity of the plasma mirror. In this study, we update the FROG analysis procedure using the least-square generalized projections algorithm. This procedure can reach convergence much faster than the previous one and has no aliasing problem. It is demonstrated that a significantly chirped VUV pulse as long as 1 ps can be precisely characterized.
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    Ryuji Itakura, Takayuki Kumada, Motoyoshi Nakano, Hiroshi Akagi. Plasma-mirror frequency-resolved optical gating for simultaneous retrieval of a chirped vacuum-ultraviolet waveform and time-dependent reflectivity[J]. High Power Laser Science and Engineering, 2016, 4(2): 02000e18
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    Received: Feb. 29, 2016
    Accepted: May. 28, 2016
    Published Online: Aug. 1, 2018
    The Author Email: Ryuji Itakura (itakura.ryuji@qst.go.jp)