Progress of Atomic Clocks toward the Redefinition of the Second : The Secondary Representations of the Second

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Other Title
  • 秒の再定義に向けての原子時計の新しい進展―秒の二次表現― （解説）
  • 秒の再定義に向けての原子時計の新しい進展--秒の二次表現
  • ビョウ ノ サイテイギ ニ ムケテ ノ ゲンシ ドケイ ノ アタラシイ シンテン ビョウ ノ 2ジ ヒョウゲン

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The rapid development of research on optical frequency measurement based on femtosecond combs has stimulated the field of frequency metrology, especially research on high-performance optical frequency standards. The International Committee for Weights and Measures (CIPM) has recommended four optical and one microwave frequency standards as "the secondary representations of the second" for future redefinition of the second. We introduce the history of the definition of the secondary, the development of the femtosecond frequency combs, and the progress of recent optical clocks.

Journal

  • Butsuri

    Butsuri 65 (2), 80-88, 2010-02-05

    The Physical Society of Japan

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