@misc{oai:repo.qst.go.jp:00076177,
 author = {Endo, Tomoyuki and Tsubochi, Masaaki and Itakura, Ryuji and Endo, Tomoyuki and Tsubouchi, Masaaki and Itakura, Ryuji},
 month = {Jun},
 note = {Pulse characterization in the vacuum-ultraviolet (VUV) region is not trivial. Since the photon energy is smaller than the ionization potentials, two-photon absorption is required to characterize a VUV waveform by the photoelectron spectroscopy. Recently, we developed an alternative method based on the time-resolved reflection spectroscopy. In this plasma-mirror frequency resolved optical gating (PM-FROG) technique, ultrafast switching of the reflectivity of a plasma mirror generated by focusing intense near-infrared (NIR) pulses on a solid target is used as a gate function. Since reflective optics is employed, this technique can be used for the characterization of broadband pulses. However, due to a damage of the solid target by laser ablation, the applicable repetition rate of PM-FROG was limited. In this study, we developed the time-resolved reflection spectroscopy with a liquid-sheet target to extend the application range, and demonstrated the eligibility of the waveform obtained by PM-FROG in a UV region. We also discussed the obtained plasma-mirror reflectivity as a function of the free-electron density to understand underlying physics of plasma formation., CLEO/Europe-EQEC 2019},
 title = {Plasma-mirror FROG using liquid-sheet water jet in ultraviolet region},
 year = {2019}
}