超高出力を生み出すテーブルトップレーザー  [in Japanese] Table-top lasers create ultrahigh peak powers  [in Japanese]

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Author(s)

    • 山川 考一 YAMAKAWA Koichi
    • 日本原子力研究所関西研究所 光量子科学研究センター Advanced Photon Research Center, KANSAI Research Establishment, Japan Atomic Energy Research Institute

Abstract

<p>30兆分の1秒(33フェムト秒)の間に,百万kWの発電設備85万基分の,850兆W(0.85ペタワット)の光を放つテーブルトップレーザーが完成した.このようなレーザーは,瞬間的にエネルギーを微小領域に集中することができるため,超高強度,超高圧,超高密度などの極限状態の下で初めて発現する現象の研究が飛躍的に進展し,荷電粒子の加速からガン治療まで幅広い応用が期待される.本稿では,最近開発に成功したペタワットチタンサファイアレーザー装置を中心に,これらのレーザー開発において最も重要となる極短パルスレーザー光の発生とその増幅過程におけるレーザー制御技術,およびこれらのレーザーを用いた応用研究の現状について紹介したい.</p>

<p>Today, the technique of chirped pulse amplification (CPA) in conjunction with advanced solid‐state laser technologies has opened up new avenues for the production of 10‐fs‐range, petawatt peak power pulses. Such laser pulses can produce super‐strong fields which correspond to 60 times the field binding the ground state electron in the hydrogen atom, and inner shell electrons of heavy atoms do not remain within the atomic center. At such intensities, the electron velocity in the laser field also becomes relativistic. Thus, the free electrons move at close to the speed of light and their mass changes dramatically compared to their rest mass. In this article, the laser technology used to produce such super‐strong fields and examples of new phenomena resulting from the application of these systems to atomic and plasma physics are reviewed.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 73(2), 186-193, 2004-02-10

    The Japan Society of Applied Physics

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Codes

  • NII Article ID (NAID)
    10011962919
  • NII NACSIS-CAT ID (NCID)
    AN00026679
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03698009
  • Data Source
    CJP  CJPref  J-STAGE 
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