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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22034–22041

Direct comparison of a Ca+ single-ion clock against a Sr lattice clock to verify the absolute frequency measurement

Kensuke Matsubara, Hidekazu Hachisu, Ying Li, Shigeo Nagano, Clayton Locke, Asahiko Nogami, Masatoshi Kajita, Kazuhiro Hayasaka, Tetsuya Ido, and Mizuhiko Hosokawa  »View Author Affiliations


Optics Express, Vol. 20, Issue 20, pp. 22034-22041 (2012)
http://dx.doi.org/10.1364/OE.20.022034


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Abstract

Optical frequency comparison of the 40Ca+ clock transition νCa (2S1/2-2D5/2, 729nm) against the 87Sr optical lattice clock transition νSr (1S0-3P0, 698nm) has resulted in a frequency ratio νCa / νSr = 0.957 631 202 358 049 9(2 3). The rapid nature of optical comparison allowed the statistical uncertainty of frequency ratio νCa / νSr to reach 1 × 10−15 in 1000s and yielded a value consistent with that calculated from separate absolute frequency measurements of νCa using the International Atomic Time (TAI) link. The total uncertainty of the frequency ratio using optical comparison (free from microwave link uncertainties) is smaller than that obtained using absolute frequency measurement, demonstrating the advantage of optical frequency evaluation. We note that the absolute frequency of 40Ca+ we measure deviates from other published values by more than three times our measurement uncertainty.

© 2012 OSA

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(120.3940) Instrumentation, measurement, and metrology : Metrology

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 4, 2012
Revised Manuscript: September 3, 2012
Manuscript Accepted: September 4, 2012
Published: September 11, 2012

Citation
Kensuke Matsubara, Hidekazu Hachisu, Ying Li, Shigeo Nagano, Clayton Locke, Asahiko Nogami, Masatoshi Kajita, Kazuhiro Hayasaka, Tetsuya Ido, and Mizuhiko Hosokawa, "Direct comparison of a Ca+ single-ion clock against a Sr lattice clock to verify the absolute frequency measurement," Opt. Express 20, 22034-22041 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-20-22034


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