Relativistic high harmonic generation in gas jet targets

A. S. Pirozhkov, M. Kando, T. Zh Esirkepov, P. Gallegos, H. Ahmed, E. N. Ragozin, A. Ya Faenov, T. A. Pikuz, T. Kawachi, A. Sagisaka, J. K. Koga, M. Coury, J. Green, P. Foster, C. Brenner, B. Dromey, D. R. Symes, M. Mori, K. Kawase, T. KameshimaY. Fukuda, L. M. Chen, I. Daito, K. Ogura, Y. Hayashi, H. Kotaki, H. Kiriyama, H. Okada, N. Nishimori, T. Imazono, K. Kondo, T. Kimura, T. Tajima, H. Daido, P. Rajeev, P. McKenna, M. Borghesi, D. Neely, Y. Kato, S. V. Bulanov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We experimentally demonstrate a new regime of high-order harmonic generation by relativistic-irradiance lasers in gas jet targets. Bright harmonics with both odd and even orders, generated by linearly as well as circularly polarized pulses, are emitted in the forward direction, while the base harmonic frequency is downshifted. A 9 TW laser generates harmonics up to 360 eV, within the 'water window' spectral region. With a 120 TW laser producing 40 uJ/sr per harmonic at 120 eV, we demonstrate the photon number scalability. The observed harmonics cannot be explained by previously suggested scenarios. A novel high-order harmonics generation mechanism [T. Zh. Esirkepov et al., AIP Proceedings, this volume], which explains our experimental findings, is based on the phenomena inherent in the relativistic laser - underdense plasma interactions (self-focusing, cavity evacuation, and bow wave generation), mathematical catastrophe theory which explains formation of electron density singularities (cusps), and collective radiation due to nonlinear oscillations of a compact charge.

Original languageEnglish
Title of host publicationLaser-Driven Relativistic Plasmas Applied to Science, Energy, Industry, and Medicine - The 3rd International Symposium
Pages167-171
Number of pages5
DOIs
Publication statusPublished - 2012
Event3rd International Symposium on Laser-Driven Relativistic Plasmas Applied to Science, Energy, Industry, and Medicine - Kyoto, Japan
Duration: 2011 May 302011 May 30

Publication series

NameAIP Conference Proceedings
Volume1465
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other3rd International Symposium on Laser-Driven Relativistic Plasmas Applied to Science, Energy, Industry, and Medicine
CountryJapan
CityKyoto
Period11/5/3011/5/30

Keywords

  • Coherent X-rays
  • Electron spikes
  • High-order harmonics
  • Relativistic laser plasma

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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