All polarization-maintaining Er:fiber-based optical frequency comb for frequency comparison of optical clocks  

作　　者：Pan Zhang Yan-Yan Zhang Ming-Kun Li Bing-Jie Rao Lu-Lu Yan Fa-Xi Chen Xiao-Fei Zhang Qun-Feng Chen Hai-Feng Jiang Shou-Gang Zhang 张攀;张颜艳;李铭坤;饶冰洁;闫露露;陈法喜;张晓斐;陈群峰;姜海峰;张首刚(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of the Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;School of Physics Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [4]School of Physics Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2022年第5期364-369,共6页中国物理B（英文版）

基　　金：Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB35030101);the National Natural Science Foundation of China(Grant No.61825505);the Quantum Control and Quantum Information of the National Key Research and Development Program of China(Grant No.2020YFA0309800);the Natural Science Basic Research Program of Shaanxi Province,China(Grant No.2020JQ434)。

摘　　要：We demonstrate an optical frequency comb(OFC)based on a turnkey mode-locked laser with a figure-9-shape structure and polarization-maintaining fibers,for the comparison of frequency among optical clocks with wavelengths of 698 nm,729 nm,1068 nm,and 1156 nm.We adopt a multi-branch approach in order to produce high power OFC signals at these specific wavelengths,enabling the signal-to-noise ratio of the beatnotes between the OFC and the clock lasers to exceed30 d B at a resolution bandwidth of 300 k Hz.This approach makes the supercontinuum spectra much easier to be generated than a single branch OFC.However,more out-of-loop fibers degrade the long-term frequency instability due to thermal drift.To minimize the thermal drift effect,we set the fiber lengths of different branches to be similar,and we stabilize the temperature as well.The out-of-loop frequency instability of the OFC due to the incoherence of the multi-branch is about5.5×10^(19) for 4000 s,while the in-loop frequency instability of fceo and that of fbeat are 7.5×10^(18) for 1 s and 8.5×10^(18) for 1 s,respectively.The turnkey OFC meets the requirement for the comparison of frequency between the best optical clocks.

关 键 词：optical frequency comb nonlinear amplifying loop mirror optical clock frequency instability 

分 类 号：TN248[电子电信—物理电子学] TH714.14[机械工程—测试计量技术及仪器]