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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 7898–7905

Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks

Daisuke Akamatsu, Masami Yasuda, Hajime Inaba, Kazumoto Hosaka, Takehiko Tanabe, Atsushi Onae, and Feng-Lei Hong  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 7898-7905 (2014)

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The frequency ratio of the 1S0(F = 1/2)-3P0(F = 1/2) clock transition in 171Yb and the 1S0(F = 9/2)-3P0(F = 9/2) clock transition in 87Sr is measured by an optical-optical direct frequency link between two optical lattice clocks. We determined the ratio (νYb/νSr) to be 1.207 507 039 343 340 4(18) with a fractional standard uncertainty of 1.5 × 10−15. The measurement uncertainty of the frequency ratio is smaller than that obtained from absolute frequency measurements using the International Atomic Time (TAI) link. The measured ratio agrees well with that derived from the absolute frequency measurement results obtained at NIST and JILA, Boulder, CO using their Cs-fountain clock. Our measurement enables the first international comparison of the frequency ratios of optical clocks. The measured frequency ratio will be reported to the International Committee for Weights and Measures for a discussion related to the redefinition of the second.

© 2014 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.3425) Lasers and laser optics : Laser stabilization
(020.3320) Atomic and molecular physics : Laser cooling

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 10, 2014
Revised Manuscript: March 19, 2014
Manuscript Accepted: March 20, 2014
Published: March 27, 2014

Daisuke Akamatsu, Masami Yasuda, Hajime Inaba, Kazumoto Hosaka, Takehiko Tanabe, Atsushi Onae, and Feng-Lei Hong, "Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks," Opt. Express 22, 7898-7905 (2014)

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