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Proceedings Paper

Frequency measurement of the 40Ca+ clock transition using a LD-based clock laser and UTC(NICT)
Author(s): K. Matsubara; Y. Li; S. Nagano; H. Ito; M. Kajita; R. Kojima; K. Hayasaka; M. Hosokawa; Y. Hanado
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Paper Abstract

We developed an optical frequency standard with the 4 2S1/2-3 2D5/2 electric quadrupole transition of 40Ca+ ions. Its absolute transition frequency is 411 042 129 776 390(±7) Hz. The accuracy is limited by the electric quadrupole shift and the ambient magnetic field fluctuation. To determine the absolute transition frequency with a better accuracy, we have observed two pairs of the symmetrically-splitting Zeeman components and measured the transition frequency corrected for the electric quadrupole shift. In addition, we are developing a magnetic-shielded ion-trap chamber to suppress the transition-line broadening caused by the magnetic field fluctuation.

Paper Details

Date Published: 25 August 2009
PDF: 8 pages
Proc. SPIE 7431, Time and Frequency Metrology II, 743108 (25 August 2009); doi: 10.1117/12.825905
Show Author Affiliations
K. Matsubara, National Institute of Information and Communications Technology (Japan)
Y. Li, National Institute of Information and Communications Technology (Japan)
S. Nagano, National Institute of Information and Communications Technology (Japan)
H. Ito, National Institute of Information and Communications Technology (Japan)
M. Kajita, National Institute of Information and Communications Technology (Japan)
R. Kojima, National Institute of Information and Communications Technology (Japan)
K. Hayasaka, National Institute of Information and Communications Technology (Japan)
M. Hosokawa, National Institute of Information and Communications Technology (Japan)
Y. Hanado, National Institute of Information and Communications Technology (Japan)


Published in SPIE Proceedings Vol. 7431:
Time and Frequency Metrology II
Tetsuya Ido; Derryck T. Reid, Editor(s)

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