Ruming Hu
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View article: Design of a Board-Level Integrated Multi-Channel Radio Frequency Source for the Transportable 40Ca+ Ion Optical Clock
Design of a Board-Level Integrated Multi-Channel Radio Frequency Source for the Transportable 40Ca+ Ion Optical Clock Open
As one of the most precise timekeeping instruments ever developed, the optical clock will be used as the measuring equipment for the next generation of second definition. The demand for the miniaturization of optical clocks is progressivel…
View article: Design of an Integrated Multi-Channel Radio Frequency Source for the Transportable 40Ca+ Ion Optical Clock
Design of an Integrated Multi-Channel Radio Frequency Source for the Transportable 40Ca+ Ion Optical Clock Open
As one of the most accurate instruments in history, the optical clock will be used as the measuring equipment for the next generation of seconds. The demand for miniaturization of optical clock is progressively urgent. In this paper, a mul…
View article: Stability improvement of <sup>40</sup>Ca<sup>+</sup> optical clock by using a transportable ultra-stable cavity
Stability improvement of <sup>40</sup>Ca<sup>+</sup> optical clock by using a transportable ultra-stable cavity Open
The instability of the clock laser is one of the primary factors limiting the instability of the optical clocks. We present an ultra-stable clock laser based on a 30-cm-long transportable cavity with an instability of ∼3 × 10 −16 at 1 s–10…
View article: Towards a transportable Ca$^+$ optical clock with a systematic uncertainty of $4.8\times 10^{-18}$
Towards a transportable Ca$^+$ optical clock with a systematic uncertainty of $4.8\times 10^{-18}$ Open
We present a compact, long-term nearly continuous operation of a room-temperature Ca$^+$ optical clock setup towards a transportable clock, achieving an overall systematic uncertainty of $4.8\times 10^{-18}$ and an uptime rate of 97.8% ove…