Absolute Frequency Measurement of the 40Ca+ Clock Transition using a LD-based Clock Laser and UTC(NICT)

被引：3

作者：

Matsubara, Kensuke ^{[1
]}

Li, Ying ^{[1
]}

Nagano, Shigeo ^{[1
]}

Ito, Hiroyuki ^{[1
]}

Kajita, Masatoshi ^{[1
]}

Kojima, Reiko ^{[1
]}

Hayasaka, Kazuhiro ^{[1
]}

Hanado, Yuko ^{[1
]}

Hosokawa, Mizuhiko ^{[1
]}

机构：

[1] Natl Inst Informat & Commun Technol, Space Time Stand Grp, Koganei, Tokyo 1848795, Japan

来源：

2009 JOINT MEETING OF THE EUROPEAN FREQUENCY AND TIME FORUM AND THE IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM, VOLS 1 AND 2 | 2009年

关键词：

METROLOGY; ATOMS; IONS;

D O I：

10.1109/FREQ.2009.5168285

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We developed an optical frequency standard using (40)Ca(+) with the 4 (2)S(1/2)-3 (2)D(5/2) electric quadrupole transition. Its absolute transition frequency is 411 042 129 776 390(7) Hz. The uncertainty is limited by the electric quadrupole shift and ambient magnetic field fluctuation. To determine the absolute transition frequency with a better uncertainty, we have observed two pairs of the symmetrically-splitting Zeeman components and measured the transition frequency which is corrected for the electric quadrupole shift. It will be used to determine the absolute transition frequency with respect to the SI base units of time and length. In addition, we are developing a magnetic-shielded ion-trap chamber to reduce the transition-line broadening caused by the magnetic field fluctuation.

引用

页码：751 / 755

页数：5

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