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Search for a narrow linewidth transition at 431 nm in ytterbium

Research Project

Project/Area Number 21K20359
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Kawasaki Akio  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究員 (40896635)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords狭線幅遷移 / 微細構造定数の時間変化 / 同位体シフト / 未知粒子の探索 / 暗黒物質探索 / 精密分光 / 狭線幅遷移探索 / レーザー冷却 / イッテルビウム
Outline of Research at the Start

イッテルビウムは光格子時計に使われる原子の一つで、通常は578 nmの狭線幅遷移が光格子時計の運用に用いられる。もう1つ431 nmの狭線幅遷移の存在が理論的に予言されているが、これまでのところ実験的には観測されていない。本研究ではまず431 nmの狭線幅レーザーを開発し、この光をレーザー冷却された原子に照射することによって狭線幅遷移の探索を行う。遷移を発見したら周辺で周波数をスキャンして中心周波数の絶対測定を行う。431 nmの遷移は微細構造定数の変化に対する感度が高い狭線幅遷移なので、基礎物理定数の時間変化の探索や同位体シフトを用いた未知のボソンの探索といった応用が期待される。

Outline of Final Research Achievements

We searched for a narrow-linewidth transition at 431 nm in ytterbium, which is predicted to be highly sensitive to the time variation of the fine structure constant. We established a system to laser-cool ytterbium atoms and a narrow-linewidth laser at 431 nm。The search was performed with shining the narrow-linewidth laser on to atoms cooled down to 30 uK, with the laser frequency scanned. We measured the absolute frequency of the transition with an accuracy less than 10 kHz and magnetic properties such as g factor and hyperfine structure.

Academic Significance and Societal Importance of the Research Achievements

これまで観測されていなかった狭線幅遷移を観測し、その絶対周波数を測定した。この測定は微細構造定数の時間変化や暗黒物質探索につながる成果であり、基礎物理の発展に寄与する。また、外場に対する感度の高い遷移であるため、この遷移と光格子時計を組み合わせることによって現在の世界最高精度の原子時計である光格子時計の精度をさらに向上させることが期待される。

Report

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

    (7 results)

All 2023 2022 Other

All Journal Article (1 results) (of which Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results) Remarks (1 results)

  • [Journal Article] Observation of the 4f146s2 1S0-4f135d6s2(J=2) clock transition at 431 nm in 171Yb2023

    • Author(s)
      Akio Kawasaki, Takumi Kobayashi, Akiko Nishiyama, Takehiko Tanabe, and Masami Yasuda
    • Journal Title

      arXiv

      Volume: 2303 Pages: 11665-11665

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Presentation] Searches for New Physics with Atomic Clocks2023

    • Author(s)
      Akio Kawasaki
    • Organizer
      Workshop on Quantum Information Science with Cold Atoms 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Dark Matter Searches with Quantum Measurements2022

    • Author(s)
      Akio Kawasaki
    • Organizer
      Kashiwa Dark Matter Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] イッテルビウムの精密分光を用いた暗黒物質探索2022

    • Author(s)
      Akio Kawasaki
    • Organizer
      First meeting of Investigating R&D committee on electronic circuit technology toward physical and engineering innovation due to new types of precise measurements
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Search for the 4f146s2 1S0-4f135d6s2(J=2) transition in Yb towards a search for the time variation of fine structure constant2022

    • Author(s)
      Akio Kawasaki
    • Organizer
      53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Search for the 4f146s2 1S0-4f135d6s2(J=2) transition in Yb towards a search f or the time variation of fine structure constant2022

    • Author(s)
      川崎瑛生
    • Organizer
      53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Remarks] 川崎瑛生のウェブページ

    • URL

      https://staff.aist.go.jp/akio.kawasaki/JPN.html

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-10-22   Modified: 2024-01-30  

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