Towards an 27Al+ ion optical clock

XU Zetian; ZENG Xiaoyi; SHI Xiaohui; CHE Huang; DENG Ke; ZHANG Jie; LU Zehuang

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Towards an 27Al+ ion optical clock

XU Zetian 1,ZENG Xiaoyi 2,SHI Xiaohui 1,CHE Huang 2,DENG Ke 1,ZHANG Jie 1 #,LU Zehuang 2 *

1.MOE Key Laboratory of Fundamental Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, 430074

2.MOE Key Laboratory of Fundamental Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, 430074

*Correspondence author

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Funding: the National Natural Science Foundation of China（No.11304109, 11174095, and 61108025）, Specialized Research Fund for the Doctoral Program of Higher Education （No.20110142120041）, the National Basic Research Program of China （No.2012CB821300）, Program for New Century Excellent Talents by the Ministry of Education（No.NCET-11-0176）

Opened online: 1 December 2014

Accepted by: none

Citation: XU Zetian,ZENG Xiaoyi,SHI Xiaohui.Towards an 27Al+ ion optical clock[OL]. [ 1 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4620210

Magnesium ion which acts as the logic ion in 27Al+ ion optical clock is trapped and laser cooled in a linear ion trap. Rabi oscillation between two hyperfine ground states of 25Mg+ ion is observed and resonant frequency between two hyperfine ground states of 25Mg+ ion is measured. Earth magnetic field is compensated with three pairs of mutually perpendicular Helmholtz coils. Light shift induced by the Raman cooling beams is measured. With the photo-ionization laser of Al, Al+ ion is trapped together with Mg+ ion. The linewidth of the clock laser of the 27Al+ ion is measured to be about 0.8 Hz. The Allan deviation of the beat note from two independent lasers is 6.5*10-15 at 1s.

Keywords:optics; optical clock; laser cooling; ultrastable laser

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