Description of a wave packet propagating in anomalous dispersion media-a new expression of propagation velocity

M. Tanaka

    研究成果: Contribution to journalArticle査読

    13 被引用数 (Scopus)

    抄録

    The propagation velocity of a wave packet applicable to anomalous dispersion media is newly derived using the saddle point method. This velocity includes the effects of both packet deformation and spreading, and coincides with the group velocity at the normal dispersion limit. A method to determine the saddle point frequency from a given initial condition is presented and the trajectory of a wave packet incident on a semi-infinite medium is obtained by integrating the new propagation velocity. It reveals that the propagation of a wave packet in anomalous dispersion media is characterized by three regions, i.e. backward, fast and slow propagation regions. The difficulty of group velocity in anomalous dispersion media is overcome.

    本文言語英語
    論文番号004
    ページ(範囲)1049-1067
    ページ数19
    ジャーナルPlasma Physics and Controlled Fusion
    31
    7
    DOI
    出版ステータス出版済み - 12 1 1989

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Condensed Matter Physics

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