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Soft-x-ray harmonic comb from relativistic electron spikes.
Pirozhkov, A S; Kando, M; Esirkepov, T Zh; Gallegos, P; Ahmed, H; Ragozin, E N; Faenov, A Ya; Pikuz, T A; Kawachi, T; Sagisaka, A; Koga, J K; Coury, M; Green, J; Foster, P; Brenner, C; Dromey, B; Symes, D R; Mori, M; Kawase, K; Kameshima, T; Fukuda, Y; Chen, L; Daito, I; Ogura, K; Hayashi, Y; Kotaki, H; Kiriyama, H; Okada, H; Nishimori, N; Imazono, T; Kondo, K; Kimura, T; Tajima, T; Daido, H; Rajeev, P; McKenna, P; Borghesi, M; Neely, D; Kato, Y; Bulanov, S V.
Affiliation
  • Pirozhkov AS; Advanced Beam Technology Division, JAEA, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan.
Phys Rev Lett ; 108(13): 135004, 2012 Mar 30.
Article in En | MEDLINE | ID: mdl-22540709
ABSTRACT
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving µJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2012 Document type: Article
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2012 Document type: Article