Plasma-mirror frequency-resolved optical gating for simultaneous retrieval of a chirped vacuum-ultraviolet waveform and time-dependent reflectivity

作     者：Ryuji Itakura Takayuki Kumada Motoyoshi Nakano Hiroshi Akagi 

作者机构：Kansai Photon Science InstituteNational Institutes for Quantum and Radiological Science and Technology(QST) Nuclear Science and Research InstituteJapan Atomic Energy Agency Department of ChemistryGraduate School of ScienceTohoku University 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程（英文版）)

年 卷 期：2016年第4卷第2期

页      面：80-84页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：partly supported by the Consortium for Photon Science and Technology programmed by MEXT of Japan JSPS KAKENHI(Grant No.26288013) the Joint Usage/Research Program on Zero-Emission Energy Research,Institute of Advanced Energy,Kyoto University(Grant No.ZE26B-27) 

主　　题：frequency-resolved optical gating least-square generalized projections algorithm plasma mirror vacuum ultraviolet 

摘      要：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.