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Superfluorescence, free-induction decay, and four-wave mixing: experimental and numerical studies of the propagation of free-electron laser pulses through dense atomic/ionic media

Research Project

Project/Area Number 19K12636
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionNational Institutes for Quantum Science and Technology

Principal Investigator

Harries James  国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 放射光科学研究センター, 上席研究員 (30416383)

Co-Investigator(Kenkyū-buntansha) 久間 晋  国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (50600045)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords自由電子レーザー / 超蛍光 / ヘリウム / コヒーレンス / 量子光学 / FEL / XFEL / 数値計算 / 原子分子 / 超放射
Outline of Research at the Start

本研究の目的は、可視光領域のレーザー技術開発によって可能となった様々な量子光学手法を、より短い波長(極端紫外線や軟X線)への応用です。成功すれば、原子や分子の電子状態と光との相互作用を制御する鍵になります。又、適切の原子系を選ぶことによって、逆に光の性質(波長、パルス長、コヒーレンス性)の制御にも繋がります。具体的に、最初の目的は自由電子レーザーの極端紫外パルスを用いて、高密度ヘリウムイオン試料における超蛍光、四波混合を研究対象とします。

Outline of Final Research Achievements

The scientific goal of the main focus of this research is the use of free-electron laser light sources to extend quantum optical effects well-established at visible wavelengths to the extreme-ultraviolet and shorter. Of particular interest is the phenomenon of "superfluorsecence", which is sensitive to the coherence of the light source used and also to coherence developed from dynamics within the medium. In earlier work we indirectly observed this phenomenon at short wavelengths (164 nm, 30.4 nm), and the goal was to directly observe the superfluorescence emissions in the time domain and compare with numerical simulations. A further goal is to explore routes to extending the observations to even shorter wavelengths.
We were successful in observing the 164 nm superfluorescence in the time domain, and comparing it with numerical simulations.

Academic Significance and Societal Importance of the Research Achievements

学術的:X線領域における量子効果は様々な光源と様々な物質で研究の対象となっている。本研究ではその光源の一つである自由電子レーザーのコヒーレンス性に敏感な現象に注目し、今後の光源利用、手法開発に貢献できた。
社会的:「量子」をキーワードとした技術開発、手法開発は今後大きなテーマとなる。本研究ではその開発のためのプローブである自由電子レーザー光源の量子性の一つであるコヒーレンスと物質のコヒーレンス性に注目し、今後の研究方針や研究基盤に貢献できた。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results)

  • [Journal Article] Demonstration of Transmission Mode Soft X-ray NEXAFS Using Third- and Fifth-Order Harmonics of FEL Radiation at SACLA BL12020

    • Author(s)
      Hiroshi Iwayama, Masanari Nagasaka, Ichiro Inoue, Shigeki Owada, Makina Yabashi, James Harries
    • Journal Title

      Applied Sciences

      Volume: 10,7852 Issue: 21 Pages: 1-7

    • DOI

      10.3390/app10217852

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Photoionisation and excitation of dense samples of helium gas using an XFEL: superfluorescence at EUV wavelengths2022

    • Author(s)
      James Harries, Arisa Iguchi, Hiroshi Iwayama, Susumu Kuma
    • Organizer
      IWP-RIXS 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A new superfluid liquid helium droplet machine2022

    • Author(s)
      James Harries, Arisa Iguchi, Susumu Kuma
    • Organizer
      原子衝突学会第47回年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Short-wavelength superfluorescence and related phenomena observed at SACLA2022

    • Author(s)
      ハリーズ ジェームズ
    • Organizer
      第35回日本放射光学会年会・放射光科学合同シンポジウム
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 原子からの超蛍光2022

    • Author(s)
      ハリーズ ジェームズ
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 世界最短波長「超蛍光」の観測2021

    • Author(s)
      J R Harries
    • Organizer
      レーザー学会学術講演会第41回年次大会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 自由電子レーザーによるヘリウムガスにおける超蛍光の観測2021

    • Author(s)
      J R Harries
    • Organizer
      第 21 回レーザー学会東京支部研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Observation of extreme ultraviolet superfluorescence from helium atoms ionised and excited using soft x-ray free-electron laser pulses2019

    • Author(s)
      J R Harries
    • Organizer
      XXXIst International Conference on Photonic, Electronic, and Atomic Collisions
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of a pulsed liquid helium droplet source for use at synchrotron and free-electron laser sources2019

    • Author(s)
      J R Harries
    • Organizer
      SACLA Users' Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Extreme ultraviolet superfluorescence from helium ions2019

    • Author(s)
      J R Harries
    • Organizer
      第35回化学反応討論会, 第35回化学反応討論会実行委員会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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