Thermal Noise Limited Ultrastable Laser for an Al+ Ion Optical Frequency Standard

ZHANG Jie; ZENG Xiaoyi; SHI Xiaohui; LIU Yang; DENG Ke; LU Zehuang

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Thermal Noise Limited Ultrastable Laser for an Al+ Ion Optical Frequency Standard

ZHANG Jie #,ZENG Xiaoyi,SHI Xiaohui,LIU Yang,DENG Ke,LU Zehuang *

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:16 December 2014

Accepted by: none

Citation: ZHANG Jie,ZENG Xiaoyi,SHI Xiaohui.Thermal Noise Limited Ultrastable Laser for an Al+ Ion Optical Frequency Standard[OL]. [16 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4622724

We demonstrate thermal noise limited ultrastable lasers for an Al+ ion optical frequency standard. The heart of an ultrastable laser is an Fabry Perot cavity made of ultra-low expansion material. We calculate the supporting positions of the cavity with quasi-static finite-element analysis. The cavity is housed in an ultrahigh vacuum chamber and the vacuum chamber is thermally stabilization with a sub-mK stability. We lock two diode lasers to two independent cavities, and measure the beat frequency between them. The linewidth of the beat frequency is measured to be about 0.88 Hz. The Allan deviation of a single laser is 1.0e-15 at 1s.

Keywords:optics; optical clock; ultrastable laser; thermal noise limit

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