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Fabrication of quasi-phase-matching device of seed crystal using and its application for wavelength conversion device

Research Project

Project/Area Number 18K14023
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 26050:Material processing and microstructure control-related
Research InstitutionTohoku University

Principal Investigator

MAEDA KENSAKU  東北大学, 金属材料研究所, 助教 (40634564)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords双晶界面 / 擬似位相整合 / 融液成長 / 成長界面 / 結晶粒界 / その場観察 / 不純物偏析 / 周期双晶 / 固液界面 / 疑似位相整合 / 種子結晶 / 非線形光学結晶 / 波長変換
Outline of Final Research Achievements

Quasi-phase-matching structure can be achieved in structures where the sign of the nonlinear optical coefficient is periodically reversed. In this study, mechanisms of twin boundary formation and impurity segregation were clarified.
Orientation of twin boundary depends on a shape of growth interface. Growth interface must be flat to keep in low index boundary (ex: {100} in lithium tetraborate and {111} in silicon). In the case of lithium tetraborate melt growth, impurity segregation occurred in solidified crystal, not in growth interface.

Academic Significance and Societal Importance of the Research Achievements

現在量産されている擬似位相整合デバイスは、強誘電体結晶に外部電界を印加して自発分極を周期反転させることで作製されている。本研究では双晶の形成メカニズムを解明した。この成果は、非強誘電体結晶においても双晶を制御することで擬似位相整合デバイスが作製可能であることを示すものである。従来、双晶は結晶中の欠陥として捉えられており、発生を抑制する技術が開発されてきた。これに対して本研究は、双晶を積極的に利用することで新たなデバイスの作製方法を実現するものである。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2019 2018

All Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Presentation] TWIN BOUNDARY FORMATION DEPENDING ON CRYSTAL/LIQUID INTERFACE MORPHOLOGY IN LITHIUM TETRABORATE2019

    • Author(s)
      Kensaku Maeda, Kozo Fujiwara, Satoshi Uda
    • Organizer
      19th International Conference on Crystal Growth and Epitaxy (ICCGE-19)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 四ホウ酸リチウムの双晶界面形成過程の直接観察2019

    • Author(s)
      前田健作、藤原航三、宇田聡
    • Organizer
      第48回結晶成長国内会議(JCCG-48)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 融液成長におけるマクロな成長界面形状変化の直接観察2019

    • Author(s)
      前田健作
    • Organizer
      大阪電気通信大学 エレクトロニクス基礎研究所 ワークショップ
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Formation mechanism of twin boundary and fabrication of periodically-twinned structure in borate crystal2019

    • Author(s)
      Kensaku Maeda, Kozo Fujiwara, Satoshi Uda
    • Organizer
      International Symposium on Modeling of Crystal Growth Processes and Devices(MCGPD-2019)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A {112}Σ3 boundary grown from the decomposition of a Σ9 boundary during directional solidification of multicrystalline silicon2019

    • Author(s)
      荘履中、前田健作、森戸春彦、藤原航三
    • Organizer
      日本金属学会2019年春期(第164回)講演大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ホウ酸塩結晶成長における包有物の形成過程2018

    • Author(s)
      前田健作、根来仁、志賀敬次、森戸春彦、藤 原航三、宇田聡
    • Organizer
      第47回結晶成長国内会議(JCCG-47)
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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