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
    Country/TerritoryJapan
    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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