@inproceedings{oai:repo.qst.go.jp:00079645,
 author = {羽島, 良一 and 永井, 良治 and 川瀬, 啓悟 and 大垣英明 and 全炳俊 and 早川恭史 and 境武志 and 住友洋介 and 島田美帆 and 宮島司 and Hajima, Ryoichi and Nagai, Ryoji and Kawase, Keigo},
 book = {Proceedings of the 39th International Free-Electron Laser Conference},
 month = {Sep},
 note = {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.},
 title = {Application of infrared FEL oscillators for producing isolated attosecond X-ray pulses via high-harmonic generation in rare gases},
 year = {2019}
}