New coherent X-ray source based on relativistic high harmonic generation in gas jet targets

ガスジェットターゲットを利用した相対論的高次高調波による新コヒーレントX線源

Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.*; 河内 哲哉; 匂坂 明人; Koga, J. K.; Coury, M.*; Green, J.*; Foster, P.*; Brenner, C.*; Dromey, B.*; Symes, D. R.*; 森 道昭; 川瀬 啓悟*; 亀島 敬*; 福田 祐仁; Chen, L. M.*; 大東 出; 小倉 浩一; 林 由紀雄; 小瀧 秀行; 桐山 博光; 岡田 大; 西森 信行; 今園 孝志; 近藤 公伯; 木村 豊秋*; 田島 俊樹; 大道 博行; Rajeev, P.*; McKenna, P.*; Borghesi, M.*; Neely, D.*; 加藤 義章* ; Bulanov, S. V.

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; Koga, J. K.; Coury, M.*; Green, J.*; Foster, P.*; Brenner, C.*; Dromey, B.*; Symes, D. R.*; Mori, Michiaki; Kawase, Keigo*; Kameshima, Takashi*; Fukuda, Yuji; Chen, L. M.*; Daito, Izuru; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Kiriyama, Hiromitsu; Okada, Hajime; Nishimori, Nobuyuki; Imazono, Takashi; Kondo, Kiminori; Kimura, Toyoaki*; Tajima, Toshiki; Daido, Hiroyuki; Rajeev, P.*; McKenna, P.*; Borghesi, M.*; Neely, D.*; Kato, Yoshiaki*; Bulanov, S. V.

ガスジェットターゲットを利用して相対論的光強度という新たな強度領域での高次高調波発生を実現した。

We experimentally demonstrate new regime of high-order harmonic generation by relativistic-irradiance lasers in gas jet targets. With 9 TW laser, the harmonics reach the "water window" spectral region. Using 120 TW laser, we demonstrate the photon number scalability, with the energy of 40 J/sr per harmonic at 120 eV. We introduce a new mechanism of high-order harmonic generation based on the relativistic plasma phenomena and catastrophe theory. The mechanism is illustrated with high-resolution 2D and 3D PIC simulations. We discuss the potential applicability of the new coherent X-ray source for bioimaging.