2022 Fiscal Year Final Research Report
Search for a narrow linewidth transition at 431 nm in ytterbium
| Project/Area Number |
21K20359
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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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)
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| 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 |
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| 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.
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| Free Research Field |
原子物理
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| 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。
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