Multiple-wavelength superfluorescence in helium following FEL excitation; Ultrafast experiments and simulations

複数波長におけるヘリウム原子の超蛍光; 超高速実験と数値計算

Harries, J.; 大饗 千彰*; 岩山 洋士*; 川口 健太郎*; 久間 晋*; 宮本 祐樹*; 永園 充*; 中嶋 享*; 矢橋 逸夫*; 繁政 英治*; 笹尾 登*; 富樫 格*; 植竹 智*; 若林 知成*; 吉見 彰洋*; 吉村 浩司*; 吉村 太彦*

Harries, J.; Ohae, Chiaki*; Iwayama, Hiroshi*; Kawaguchi, Kentaro*; Kuma, Susumu*; Miyamoto, Yuki*; Nagasono, Mitsuru*; Nakajima, Kyo*; Yabashi, Itsuo*; Shigemasa, Eiji*; Sasao, Noboru*; Togashi, Tadashi*; Uetake, Satoshi*; Wakabayashi, Tomonari*; Yoshimi, Akihiro*; Yoshimura, Koji*; Yoshimura, Motohiko*

Superfluorescence is the rapid, collective emission of radiation following the ultrafast creation of a population inversion in an atomic medium. We report the results of experiments and simulations for the excitation of helium atoms using pulses from the SCSS EUV free-electron laser.