High-order harmonics from singularities of relativistic plasma

相対論的プラズマの特異点からの高次高調波発生

Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Pikuz, T. A.*; Faenov, A. Ya.*; 小倉 浩一; 林 由紀雄; 小瀧 秀行; Ragozin, E. N.*; Neely, D.*; 桐山 博光; Koga, J. K.; 福田 祐仁; 錦野 将元; 今園 孝志; 長谷川 登; 河内 哲哉; 大道 博行; 加藤 義章* ; Bolton, P.; Bulanov, S. V.; 近藤 公伯

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T. A.*; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; Kiriyama, Hiromitsu; Koga, J. K.; Fukuda, Yuji; Nishikino, Masaharu; Imazono, Takashi; Hasegawa, Noboru; Kawachi, Tetsuya; Daido, Hiroyuki; Kato, Yoshiaki*; Bolton, P.; Bulanov, S. V.; Kondo, Kiminori

We have discovered a new regime of high-order harmonic generation in gas jet targets driven by multi-TW femtosecond lasers. In this presentation, we discuss the results of recent experiments demonstrating bright off-axis () XUV harmonic emission. High-resolution harmonic source imaging reveals that the radiation is emitted by tiny sub-m sources, in accordance with the model prediction.