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High harmonic generation in underdense relativistic plasma

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Ragozin, E. N.*; Faenov, A. Y.; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; Mori, Michiaki; Kawase, Keigo; Koga, J. K.; Kameshima, Takashi*; Fukuda, Yuji; Ma, J.*; Chen, L. M.*; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Kotaki, Hideyuki; Kiriyama, Hiromitsu; Okada, Hajime; Nishimori, Nobuyuki; Kondo, Kiminori; Kimura, Toyoaki*; Tajima, Toshiki; Daido, Hiroyuki; Kato, Yoshiaki* ; Bulanov, S. V.

We present experimental results on high-order harmonic generation during the interaction of relativistic-irradiance 9 TW laser with helium gas jet. We observed resolved odd and even harmonics with wavelength down to 7 nm (harmonic order $$>$$ 100) and unresolved spectra down to 4 nm (order $$>$$ 200). These results demonstrate a new mechanism of harmonic generation, which can be used as a diagnostic tool and may eventually open the way to a new convenient coherent X-ray source.

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