Improving lattice-light-shift uncertainty of an 171Yb optical clock with optimized cooling and trapping lasers

Author:

Peng Chengquan1ORCID,Zhang Tao1ORCID,Sun Changyue1ORCID,Qi Qichao1ORCID,Jin Taoyun1ORCID,Lei Shuai1ORCID,Zhao Chengcheng1ORCID,Feng Suzhen1ORCID,Xia Yan1ORCID,Xu Xinye123ORCID

Affiliation:

1. State Key Laboratory of Precision Spectroscopy, East China Normal University 1 , Shanghai 200241, China

2. Shanghai Research Center for Quantum Sciences 2 , Shanghai 201315, China

3. Shanghai Branch, Hefei National Laboratory 3 , Shanghai 201315, China

Abstract

Atoms confined in the optical lattice can be interrogated with Doppler- and recoil-free operation. However, if not properly controlled, the optical lattice may limit clock accuracy. To improve the lattice-light-shift uncertainty, the cooling and trapping lasers' frequency stability is optimized, and the atom's signal stability is enhanced. A ring-cavity Ti:sapphire laser is locked to the optical frequency comb, which is referenced to a 578 nm ultra-stable laser, and the beat note's stability is on the order of 10−16. Using a 10 cm Fabry–Pérot cavity referenced to the Ti:sapphire laser, the optical frequency stability is transferred to the 399 nm cooling laser, creating favorable conditions for evaluating the lattice-light-shift accurately. We reevaluate lattice-light-shift in our 171Yb optical lattice clock with an uncertainty of 8.1 × 10−18, which is an order lower than our previous result, and the magic frequency is determined to be 394 798 266.6(1.3) MHz.

Funder

Shanghai Manicipal Science and Technology Major Project

National Natural Science Foundation of China

National Key Research and Development Program of China

Shanghai Excellent Academic Leaders Program

Publisher

AIP Publishing

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