[14a-C32-1~11] 3.6 Ultrashort-pulse and high-intensity lasers

[14a-C32-11] Plasma-Mirror Frequency-Resolved Optical Gating in VUV region

〇Ryuji Itakura¹, Hiroshi Akagi¹, Yoriko Wada¹, Tomohito Otobe¹ (1.QST KPSI)

Keywords:plasma mirror, Frequency-resolved optical gating, Vacuum ultraviolet

Laser plasma is formed on a fused silica surface by focusing an output laser pulse (80 fs) from a Ti:Sapphire amplifier. Time-resolved vacuum-ultraviolet reflection spectra of the fifth-harmonics (160 nm) are recorded. We perform the FROG analysis and reveal that the pulse duration of the fifth harmonic is 13 fs FWHM, which is nearly Fourier-transform limited. The reflectivity of the plasma mirror as well as the Fresnel reflection of the unexcited surface is also extracted.