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Hong FL, Musha M, Takamoto M, et al. Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer. Opt Lett. 2009;34(5):692-4doi: 10.1364/ol.34.000692.
Hong, F. L., Musha, M., Takamoto, M., Inaba, H., Yanagimachi, S., Takamizawa, A., Watabe, K., Ikegami, T., Imae, M., Fujii, Y., Amemiya, M., Nakagawa, K., Ueda, K., & Katori, H. (2009). Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer. Optics letters, 34(5), 692-4. https://doi.org/10.1364/ol.34.000692
Hong, F-L, et al. "Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer." Optics letters vol. 34,5 (2009): 692-4. doi: https://doi.org/10.1364/ol.34.000692
Hong FL, Musha M, Takamoto M, Inaba H, Yanagimachi S, Takamizawa A, Watabe K, Ikegami T, Imae M, Fujii Y, Amemiya M, Nakagawa K, Ueda K, Katori H. Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer. Opt Lett. 2009 Mar 01;34(5):692-4. doi: 10.1364/ol.34.000692. PMID: 19252595.
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Opt Lett. 2009 Mar 01;34(5):692-4. doi: 10.1364/ol.34.000692.

Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer.

Optics letters

F-L Hong, M Musha, M Takamoto, H Inaba, S Yanagimachi, A Takamizawa, K Watabe, T Ikegami, M Imae, Y Fujii, M Amemiya, K Nakagawa, K Ueda, H Katori

Affiliations

  1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technologies, Tsukuba, Ibaraki, Japan. [email protected]

PMID: 19252595 DOI: 10.1364/ol.34.000692

Abstract

We demonstrate a precision frequency measurement using a phase-stabilized 120 km optical fiber link over a physical distance of 50 km. The transition frequency of the (87)Sr optical lattice clock at the University of Tokyo is measured to be 429228004229874.1(2.4) Hz referenced to international atomic time. The results demonstrate the excellent functions of the intercity optical fiber link and the great potential of optical lattice clocks for use in the redefinition of the second.

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