Fundamental Mechanisms of Laser Desorption and Plume Formation from Ionic Crystals (レ-ザ-アブレ-ション小特集) Fundamental Mechanisms of Laser Desorption and Plume Formation from Ionic Crystals

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In applications of high intensity lasers to materials processing, the formation of an ablation plume is of high importance. For wide bandgap insulators (e.g., oxides, halides, nitrides, carbides) irradiated with sub bandgap photon energies, the route to plume formation is not well understood. For example, contrary to metals and semiconductors, inverse bremsstrahlung (IB) is not possible for a wide range of laser intensities on these materials due to insufficient photon and electron densities. We present an alternative path to plume formation on nominally transparent materials. We first examine the interaction of photo-and thermally-emitted particles from exposure to pulsed laser irradiation of surfaces which include photoelectrons, energetic positive ions, and neutral metal atoms. We establish experimentally that there is overlap in space and time of significant portions of the distributions of these particles in the near surface region. We present a model for the collective motion of these particles and show that as laser fluence is increased we achieve sufficient densities, overlap, and kinetic energies to result in the onset of plume fluorescence and eventually ionization at fluences far below any IB or catastrophic breakdown process.

収録刊行物

  • レーザー研究

    レーザー研究 25(4), 267-277, 1997-04-15

    The Laser Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002043403
  • NII書誌ID(NCID)
    AN00255326
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    03870200
  • NDL 記事登録ID
    4204998
  • NDL 雑誌分類
    ZN33(科学技術--電気工学・電気機械工業--電子工学・電気通信)
  • NDL 請求記号
    Z16-1040
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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