High-order harmonics from bow wave caustics driven by a high-intensity laser

T. Zh Esirkepov, A. S. Pirozhkov, M. Kando, 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

Abstract

We propose a new mechanism of high-order harmonic generation during an interaction of a high-intensity laser pulse with underdense plasma. A tightly focused laser pulse creates a cavity in plasma pushing electrons aside and exciting the wake wave and the bow wave. At the joint of the cavity wall and the bow wave boundary, an annular spike of electron density is formed. This spike surrounds the cavity and moves together with the laser pulse. Collective motion of electrons in the spike driven by the laser field generates high-order harmonics. A strong localization of the electron spike, its robustness to oscillations imposed by the laser field and, consequently, its ability to produce high-order harmonics is explained by catastrophe theory. The proposed mechanism explains the experimental observations of high-order harmonics with the 9 TW J-KAREN laser (JAEA, Japan) and the 120 TW Astra Gemini laser (CLF RAL, UK) [A. S. Pirozhkov, et al., arXiv:1004.4514 (2010); A. S. Pirozhkov et al, AIP Proceedings, this volume]. The theory is corroborated by high-resolution two-and three-dimensional particle-in-cell simulations.

Original languageEnglish
Title of host publicationLaser-Driven Relativistic Plasmas Applied to Science, Energy, Industry, and Medicine - The 3rd International Symposium
Pages172-180
Number of pages9
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

  • Laser-plasma interaction
  • bow wave
  • catastrophe theory
  • coherent X-ray sources
  • high-order harmonics generation
  • particle-in-cell simulation
  • wakefield
  • water window

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Esirkepov, T. Z., Pirozhkov, A. S., Kando, M., Gallegos, P., Ahmed, H., Ragozin, E. N., Faenov, A. Y., 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., ... Bulanov, S. V. (2012). High-order harmonics from bow wave caustics driven by a high-intensity laser. In Laser-Driven Relativistic Plasmas Applied to Science, Energy, Industry, and Medicine - The 3rd International Symposium (pp. 172-180). (AIP Conference Proceedings; Vol. 1465). https://doi.org/10.1063/1.4737558