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High-order harmonics from gas jet targets with multi-TW lasers at intensities $$>$$ 10$$^{18}$$ W/cm$$^2$$

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

We discovered a new high-order harmonic generation regime in the interaction of multi-TW relativistic-irradiance femtosecond lasers with gas jet targets. The spectra consisting of hundreds of even and odd harmonic orders are generated by either linearly or circularly polarized pulses. We proposed a new harmonic generation mechanism, where the harmonics are collectively emitted by oscillating electron spikes, whose sharpness and stability are explained by catastrophe theory.

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