Frequency measurement of the 40Ca+ clock transition using a LD-based clock laser and UTC(NICT)

K. Matsubara; Y. Li; S. Nagano; H. Ito; M. Kajita; R. Kojima; K. Hayasaka; M. Hosokawa; Y. Hanado

doi:10.1117/12.825905

25 August 2009 Frequency measurement of the ⁴⁰Ca⁺ clock transition using a LD-based clock laser and UTC(NICT)

K. Matsubara, Y. Li, S. Nagano, H. Ito, M. Kajita, R. Kojima, K. Hayasaka, M. Hosokawa, Y. Hanado

Proceedings Volume 7431, Time and Frequency Metrology II; 743108 (2009) https://doi.org/10.1117/12.825905
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We developed an optical frequency standard with the 4 ²S_1/2-3 ²D_5/2 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.

Citation Download Citation

K. Matsubara, Y. Li, S. Nagano, H. Ito, M. Kajita, R. Kojima, K. Hayasaka, M. Hosokawa, and Y. Hanado "Frequency measurement of the ⁴⁰Ca⁺ clock transition using a LD-based clock laser and UTC(NICT)", Proc. SPIE 7431, Time and Frequency Metrology II, 743108 (25 August 2009); https://doi.org/10.1117/12.825905

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