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12 September 2011 Atomic frequency standards at NICT
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Abstract
Various activities of atomic frequency standards studied in National Institute of Information and Communications Technology (NICT) are briefly reviewed. After BIPM accepted the first cesium fountain clock in NICT as a reference to determine International Atomic Time (TAI), efforts to further reduce the uncertainty of collision shifts are ongoing. A second fountain clock using atomic molasses is being built to enable the operation with less atomic density. Single ion clock using calcium has been pursued for several years in NICT. The absolute frequency measured in 2008 has CIPM to adopt the Ca+ clock transition as a part of the list of radiation (LoR) to realize the meter. Sr lattice clock has started its operation last year. The absolute frequency agreed well with those obtained in other institutes. Study of stable cavities to stabilize clock lasers are also introduced.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Ido, M. Fujieda, H. Hachisu, K. Hayasaka, M. Kajita, R. Kojima, M. Kumagai, C. Locke, Y. Li, K. Matsubara, A. Nogami, N. Shiga, A. Yamaguchi, Y. Koyama, M. Hosokawa, and Y. Hanado "Atomic frequency standards at NICT", Proc. SPIE 8132, Time and Frequency Metrology III, 81320D (12 September 2011); https://doi.org/10.1117/12.892887
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