パルスファイバレーザーの高出力化を目的とした全ファイバ型位相加算レーザーシステムの開発  [in Japanese] Development of an all Fiber Coherent Beam Combining System toward High Energy Pulse Fiber Lasers  [in Japanese]

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Author(s)

    • 閑林 優太 Kambayashi Yuta
    • 近畿大学大学院 総合理工学研究科 Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University
    • 吉田 実 Yoshida Minoru
    • 近畿大学大学院 総合理工学研究科 Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University
    • 井上 大樹 Inoue Tatsuki
    • 近畿大学大学院 総合理工学研究科 Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University

Abstract

Our present work develops an all fiber coherent beam combining system to achieve a high energy pulse fiber laser beyond pulse energy limits due to nonlinear effects in rare-earth-doped fibers. Coherent beam combining is a power addition technology that obtains high energy density and high beam quality because it integrates multiple laser beams in a mono-light wave. However, the coherent beam combining using optical fibers is technically difficult because the optical phases and polarizations in optical fibers fluctuate due to disturbances. Therefore, we developed a novel all fiber coherent beam combining system that can precisely control optical path lengths and automatically compensate polarization changes.  When the system combined four laser pulses, it achieved a beam-combining efficiency of 96.6% that was about four times as high as a pulse energy before combining. In addition, the system obtained 97.1% beam-combining efficiency of coherent beam combining using femtosecond pulses that have very low coherences by minimizing the optical path-length differences between combined two pulses. Moreover, the system successfully regulated the beam-combining-efficiency changes to less than 2.0 percentage points in full width by suppressing optical path-length fluctuations and tracking-control of the optical phases.

Journal

  • IEEJ Transactions on Electronics, Information and Systems

    IEEJ Transactions on Electronics, Information and Systems 136(1), 70-75, 2016

    The Institute of Electrical Engineers of Japan

Codes

  • NII Article ID (NAID)
    130005116480
  • NII NACSIS-CAT ID (NCID)
    AN10065950
  • Text Lang
    JPN
  • ISSN
    0385-4221
  • NDL Article ID
    027043013
  • NDL Call No.
    Z16-795
  • Data Source
    NDL  J-STAGE 
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