Author: Shimada, M.
Paper Title Page
TUD02 Application of Infrared FEL Oscillators for Producing Isolated Attosecond X-Ray Pulses via High-Harmonic Generation in Rare Gases 272
  • R. Hajima, K. Kawase, R. Nagai
    QST, Tokai, Japan
  • Y. Hayakawa, T. Sakai, Y. Sumitomo
    LEBRA, Funabashi, Japan
  • T. Miyajima, M. Shimada
    KEK, Ibaraki, Japan
  • H. Ohgaki, H. Zen
    Kyoto University, Kyoto, Japan
  Funding: Quantum Leap Flagship Program (MEXT Q-LEAP)
High harmonic generation (HHG) in rare gases is now becoming a common technology to produce attosecond pulses in VUV wavelengths. So far HHG sources have been realized by femtosecond solid-state lasers, not FELs. We propose a FEL-driven HHG source to explore attosecond pulses at photon energies above 1 keV with a MHz-repetition, which is difficult with solid-state lasers [1]. A research program has been launched to establish technologies for the FEL-HHG, which covers generation and characterization of few-cycle IR pulses in a FEL oscillator, stacking of FEL pulses in an external cavity, and a seed laser for stabilization of carrier-envelope phase in a FEL oscillator. In this talk, we present the scheme of FEL-HHG and the status of the research program.
[1] R. Hajima and R. Nagai, Phys. Rev. Lett. 119, 204802 (2017)
slides icon Slides TUD02 [8.995 MB]  
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About • paper received ※ 23 August 2019       paper accepted ※ 29 August 2019       issue date ※ 05 November 2019  
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IR-FEL Project at the cERL and Future EUV-FEL Lithography  
  • R. Kato, Y. Honda, H. Kawata, T. Miyajima, N. Nakamura, H. Sakai, M. Shimada, Y. Tanimoto, K. Tsuchiya
    KEK, Ibaraki, Japan
  Recently KEK has launched an infrared FEL project with a competitive funding from NEDO (New Energy and Industrial Technology Development Organization). The purpose of this project is to build a mid-infrared FEL at the compact Energy Recovery Linac (cERL), and to use that FEL as a light source for construction of the processing database required for industrial lasers. The FEL system is composed of two 3 m undulators and a matching section between them, and generates light with a maximum pulse energy of 1 µJ at the wavelength of 20 µm with an 81.25 MHz repetition rate. The FEL is also expected to become a proof-of-concept machine for ERL base FELs for future EUV lithography. The detail of the project will be presented, and the relationship of the technical development between the mid-infrared FEL and the future EUV-FEL will be discussed.  
slides icon Slides THA03 [5.424 MB]  
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