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Elucidation of the mechanism of photodarkening that hinders high output of visible silica fiber lasers

Research Project

Project/Area Number 21K04658
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionToyota Technological Institute

Principal Investigator

Saito Kazuya  豊田工業大学, 工学部, 教授 (20278394)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsファイバレーザー / ファイバアンプ / シリカガラス / フォトダークニング / 可視ファイバレーザー / ファイバレーザ / 構造緩和
Outline of Research at the Start

青色LDを励起源とした高出力・可視シリカファイバレーザーの開発は、赤外ファイバレーザーでは加工が難しい銅などの赤外吸収の少ない金属を加工するのに渇望されている。しかしながら、可視シリカファイバレーザーの実用化には、フォトダークニング抑制という非常に困難な課題がある。フォトダークニングとは、励起レーザーにより欠陥が生成する現象で、生成した欠陥による吸収増加でレーザー発振が阻害される。本研究では、可視シリカファイバレーザーの高出力化を阻害するフォトダークニングの機構解明を行う。

Outline of Final Research Achievements

The development of a high-power, visible silica fiber laser using a blue LD as an excitation source is highly desirable for processing metals with low infrared absorption, such as copper, which is difficult to process with infrared fiber lasers. However, the practical application of visible silica fiber lasers faces the extremely difficult task of suppressing photodarkening. Photodarkening is a phenomenon in which defects are generated by the excitation laser, and the increased absorption caused by the generated defects inhibits laser oscillation. In this study, we clarified the photodarkening mechanism in Dy-doped silica fiber and identified co-doping agents that are effective in suppressing photodarkening.

Academic Significance and Societal Importance of the Research Achievements

本研究では、高出力可視加工用レーザーの候補であるDy添加黄色シリカファイバレーザーの実用化に向けた課題解決を行った。具体的にはフォトダークニングの機構解明と抑制法の開発を行った。これらの研究は、欠陥構造の生成機構解明という学術的意義があるにとどまらず、高出力可視ファイバレーザーの実用化に向けた突破口を開くもので、社会的意義も大きい。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (5 results)

  • [Journal Article] Difference between X-ray-induced and 451 nm LD-induced photodarkening in DyAlGe-doped silica glasses2023

    • Author(s)
      T. Okazaki, K. Kawai, C. Otsuka, E. H. Sekiya, Y. Kanbayashi, M. Mizusaki and K. Saito
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: 4 Pages: 042003-042003

    • DOI

      10.35848/1347-4065/acc8ab

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of P co-doping on X-ray/450 nm LD induced photodarkening in Dy<sup>3+</sup> doped silica glass and fiber laser2022

    • Author(s)
      Okazaki Tomoya、Fujigaki Yuma、Sekiya Edson Haruhico、Kawai Kota、Mizusaki Masato、Kanbayashi Yuta、Saito Kazuya
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 6 Pages: 060911-060911

    • DOI

      10.35848/1347-4065/ac6fa4

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Diode pumped visible Dy3+-doped silica fiber laser: Ge-co-doping effects on lasing efficiency and photodarkening2022

    • Author(s)
      Tomoya Okazaki, Chiaki Otsuka, Edson H. Sekiya, Kota Kawai, Masato Mizusaki, Yuta Kanbayashi, and Kazuya Saito
    • Journal Title

      Applied Physics Express

      Volume: 15 Issue: 1 Pages: 012002-012002

    • DOI

      10.35848/1882-0786/ac3d1d

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ge-codoping effect on X-ray-induced photodarkening in Al-doped and Dy-Al-doped silica glass2022

    • Author(s)
      Tomoya Okazaki, Kota Kawai, Chiaki Otsuka, Takehiro Mori, Yota Saeki, Edson Haruhico Sekiya, and Kazuya Saito
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 3 Pages: 032002-032002

    • DOI

      10.35848/1347-4065/ac4d02

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] B/YbB/YbAlB 添加シリカガラスにおける X 線誘起欠陥と局所構造の研究2024

    • Author(s)
      山田圭吾、 荒川修一、 齋藤和也
    • Organizer
      The 34th Meeting on Glasses for Photonics 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Dy添加シリカガラスにおけるB添加によるフォトダークニング抑制効果2023

    • Author(s)
      山田圭吾、齋藤和也
    • Organizer
      第84回応物秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Dy添加シリカガラスのB共添加効果2023

    • Author(s)
      山田圭吾, 齋藤和也
    • Organizer
      The 33rd Meeting on Glasses for Photonics
    • Related Report
      2022 Research-status Report
  • [Presentation] Ge添加シリカガラスにおける紫外線誘起欠陥の熱アニーリング2023

    • Author(s)
      長壁摩耶, 齋藤和也
    • Organizer
      The 33rd Meeting on Glasses for Photonics
    • Related Report
      2022 Research-status Report
  • [Presentation] ブリルアン散乱光を用いた分布型光ファイバセンサにおける構造緩和および応力緩和の影響2022

    • Author(s)
      山田圭吾, 齋藤和也 , 是枝聡肇 , 熊谷芳宏 , 手塚信一郎 , 松浦聡
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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