Experimental setup of NTSC SrII optical lattice clock

doi:10.1088/1674-1056/adecfd

Abstract We report the SrII optical lattice clock at the National Time Service Center (NTSC). In this system, a blackbody radiation shield with movable lattice mitigates blackbody radiation shifts through active temperature control. A shallow optical lattice with minimal tunneling minimizes AC Stark shifts. Phase-locked counter-propagating lattice beams and conductive vacuum viewports further reduce systematic uncertainties and a novel initial-state preparation method simplifies the system. Clock transition spectra achieve a linewidth of 2.5 Hz with a 400 ms clock pulse, and self-comparison stability reaches 5.1$\times10^{-16}$ at 1 s. These advancements give this clock the potential to be a critical platform for realizing outstanding systematic uncertainties in the future.

Keywords: optical lattice optical clock strontium

Received: 20 May 2025
Revised: 30 June 2025
Accepted manuscript online: 08 July 2025

PACS:	37.10.Jk	(Atoms in optical lattices)
	32.70.Jz	(Line shapes, widths, and shifts)
	06.30.Ft	(Time and frequency)
	42.62.Eh	(Metrological applications; optical frequency synthesizers for precision spectroscopy)

Fund: This study is supported by the Innovation Program for Quantum Science and Technology (Grant Nos. 2021ZD0300900 and 2021ZD0300902), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB35010202), and the Operation and Maintenance of Major Scientific and Technological Infrastructure of the Chinese Academy of Sciences (Grant No. 2024000014).

Corresponding Authors: Xiao-Tong Lu, Hong Chang
E-mail: luxiaotong@ntsc.ac.cn;changhong@ntsc.ac.cn

Cite this article:

Feng Guo(郭峰), Jia-An Li(李家安), Yan-Yan Liu(刘艳艳), Xiao-Tong Lu(卢晓同), and Hong Chang(常宏) Experimental setup of NTSC SrII optical lattice clock 2026 Chin. Phys. B 35 023702

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Experimental setup of NTSC SrII optical lattice clock

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