A transportable optical lattice clock at the National Time Service Center

doi:10.1088/1674-1056/ab9290

Abstract We report a transportable one-dimensional optical lattice clock based on ⁸⁷Sr at the National Time Service Center. The transportable apparatus consists of a compact vacuum system and compact optical subsystems. The vacuum system with a size of 90 cm×20 cm×42 cm and the beam distributors are assembled on a double-layer optical breadboard. The modularized optical subsystems are integrated on independent optical breadboards. By using a 230 ms clock laser pulse, spin-polarized spectroscopy with a linewidth of 4.8 Hz is obtained which is close to the 3.9 Hz Fourier-limit linewidth. The time interleaved self-comparison frequency instability is determined to be 6.3×10^-17 at an averaging time of 2000 s.

Keywords: optical lattice clock strontium atoms spin-polarized spectra instability

Received: 20 February 2020
Revised: 30 April 2020
Accepted manuscript online:

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

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61775220 and 11803042), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).

Corresponding Authors: Hong Chang
E-mail: changhong@ntsc.ac.cn

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De-Huan Kong(孔德欢), Zhi-Hui Wang(王志辉), Feng Guo(郭峰), Qiang Zhang(张强), Xiao-Tong Lu(卢晓同), Ye-Bing Wang(王叶兵), Hong Chang(常宏) A transportable optical lattice clock at the National Time Service Center 2020 Chin. Phys. B 29 070602

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A transportable optical lattice clock at the National Time Service Center

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