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URSI Regional Conference on Radio Science (URSI-RCRS)

Development of a Ytterbium-ion optical clock to explore fundamental science

Subhadeep De

Published Jan 1, 2024• 0 citations
Publisher
DOI
10.46620/ursi_rsrc24/0051ggo7263

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SummaryThe optical clock based on trapped ions has attracted great interest due to the important significance in fundamental physics and application prospects in metrology of time and frequency. The ytterbium ion has unique advantages in developing transportable and miniaturized optical clocks because it has long storage time and its related laser system is compact. In addition, the171Yb+ion has two clock transition lines, which can perform frequency self-comparison. This paper mainly introduces the progress in the development of the transportable optical clock system based on the single171Yb+ion at Tsinghua University, China. A transportable physical package, including the vacuum system, optic system and imaging system is presented and implemented to automatically detect the presence of trapped ion.
With the development of optical frequency comb and ultra-stable laser techniques, the performance of optical frequency standards has been improved significantly over the past decades. Single charged Yb ions have an alkali-like atomic structure and have ultra-long storage time. And the ytterbium single-ion optical frequency standards have two clock transitions (E2 & E3). In this paper, we will introduce the progress in the development of a highly accurate optical frequency standard based on single ytterbium-171 ion at the National Institute of Metrology (NIM), China.
Optical clocks serve as the benchmark devices for the next-generation definition of the second and have significant applications in testing the theories beyong the standard models, dark matter research, and related fields.The ytterbium ion optical clock, featuring two clock transition lines, is among the most precise optical clocks with the lowest uncertainties.The National Institute of Metrology, China (NIM), initiated research on ytterbium ion optical clocks in 2021.Based on an end-cap ion trap, a vacuum system has been established.A 370 nm thirdharmonic fiber laser, along with 760 nm and 935 nm DFB lasers, ensures a stable operation of the optical system.To date, both the electric quadrupole and electric octupole clock transitions have been observed.A 2.8 Hz linewidth of the electric octupole transition has been achieved, with a stability of 1.7E-15 τ -1/2 after closed-loop locking.The uncertainties due to AC Starks shift from clock laser and second-order Doppler shifts are being evaluated, with an expected total uncertainty below 5E-18.