Development of an atomic fountain operational in a long term with extremely high frequency stability
| Project/Area Number |
15K21669
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
General applied physics
Measurement engineering
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
Takamizawa Akifumi 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, 主任研究員 (50462833)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 原子泉一次周波数標準器 / 外部共振器半導体レーザ / ２次元磁気光学トラップ / 原子泉 |
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| Outline of Final Research Achievements |
For continuous long-term operation of an atomic fountain, I developed external cavity diode lasers whose frequency could be locked during more than several months, and implemented in the optical system of an atomic fountain. In this laser, the cavity insensitive to misalignment with a cat's eye configuration was made without any position adjusters for high mechanical robustness. Moreover, the housing for the laser was sealed from outside to suppress frequency drift by variation in atmosphere pressure.
In an atomic fountain, the number of cold atoms was increased by modifying the optical configuration for optical molasses and optical pumping. Consequently, the frequency stability was improved to 7×10-14/tau(1/2) (tau: averaging time (s)). Moreover, the systematic uncertainty was evaluated to be 6.1×10-16.
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| Academic Significance and Societal Importance of the Research Achievements |
セシウム原子泉は16桁の精度で時間周波数の標準を実現するが、基本的には秒の長さを決めるものであり、時刻を刻む時計として用いるには長期間連続的に動作させることが必要となる。本研究では、超高精度のセシウム原子泉のさらなる高精度化と時計としての安定した動作を実現するために、時計の精度に直結する周波数安定度の向上と長期連続運転を両立させ、原子泉の総合的な性能を向上させた。また、長期連続運転のために開発した外部共振器半導体レーザは、原子泉だけでなく原子重力計や原子磁気センサなどのレーザ冷却や原子分光を利用した実験装置を将来実用化する際に、極めて有用なレーザ光源となりうる。
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Report
(5 results)
Research Products
(23 results)
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[Journal Article] Improved frequency measurement of the 1S0-3P0 clock transition in 87Sr using a Cs fountain clock as a transfer oscillator2015
Author(s)
Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae, and Kazumoto Hosaka
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Journal Title
Journal of the Physical Society of Japan
Volume: 84
Issue: 11
Pages: 115002-115002
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] Precise frequency comparison of clocks considering the dead time uncertainty of frequency link2016
Author(s)
Kazumoto Hosaka, Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae
Organizer
The European Frequency and Time Forum (EFTF) 2016
Place of Presentation
イギリス、ヨーク
Year and Date
2016-04-07
Related Report
Int'l Joint Research
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[Presentation] 2台の電気的冷却方式低温サファイア発振器間の周波数安定度測定2016
Author(s)
Takeshi Ikegami, Ken-ichi Watabe, Shinya Yanagimachi, Akifumi Takamizawa, Iku Hirano, Ken Hagimoto, John G. Hartnett
Organizer
第63回応用物理学会春季学術講演会
Place of Presentation
東京都目黒区
Year and Date
2016-03-19
Related Report
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[Presentation] ストロンチウム原子の時計遷移の絶対周波数測定 -SI秒との比較における不確かさの低減-2016
Author(s)
Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae, and Kazumoto Hosaka
Organizer
第63回応用物理学会春季学術講演会
Place of Presentation
東京都目黒区
Year and Date
2016-03-19
Related Report
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[Presentation] Yb and Sr optical lattice clocks at NMIJ2016
Author(s)
Kazumoto Hosaka, Takumi Kobayashi, Tomoya Suzuyama, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Takehiko Tanabe, Daisuke Akamatsu, Masami Yasuda, Hajime Inaba, Sho Okubo, Feng-Lei Hong, Atsushi Onae
Organizer
ERATO International Workshop:Challenges in Precision Science
Place of Presentation
東京都文京区
Year and Date
2016-01-25
Related Report
Int'l Joint Research
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[Presentation] Sr光格子時計の絶対周波数測定 -SI秒との比較における不確かさの軽減-2015
Author(s)
Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae, and Kazumoto Hosaka
Organizer
量子エレクトロニクス研究会「極限計測の科学と技術」
Place of Presentation
山梨県 山中湖畔
Year and Date
2015-12-18
Related Report
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[Presentation] Accurate frequency comparison of clocks considering the effect of the distributed dead-time2015
Author(s)
Kazumoto Hosaka, Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae
Organizer
Asia Pacific Workshop on Time and Frequency 2015
Place of Presentation
中国、北京
Year and Date
2015-10-31
Related Report
Int'l Joint Research
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