Improvement in the stability of a 40Ca+ ion optical clock using the Ramsey method
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Applied Physics"
DOI: 10.1063/5.0012726
Abstract: The fractional uncertainty of the 40Ca+ optical clock in our laboratory has been evaluated to be 2.2 × 10 − 17, but it is difficult to evaluate the statistical uncertainty of the output frequency at… read more here.
Keywords: 40ca ion; ion; ramsey method; optical clock ... See more keywords
Robust optical clock transitions in trapped ions using dynamical decoupling
Sign Up to like & getrecommendations! Published in 2019 at "New Journal of Physics"
DOI: 10.1088/1367-2630/ab3871
Abstract: We present a novel method for engineering an optical clock transition that is robust against external field fluctuations and is able to overcome limits resulting from field inhomogeneities. The technique is based on the application… read more here.
Keywords: clock transitions; robust optical; transitions trapped; trapped ions ... See more keywords
On a definition of the SI second with a set of optical clock transitions
Sign Up to like & getrecommendations! Published in 2019 at "Metrologia"
DOI: 10.1088/1681-7575/ab3a82
Abstract: The current SI second based on the atomic hyperfine transition in the ground state of 133Cs is expected to be replaced by a new definition based on optical frequency standards, whose estimated uncertainty has now… read more here.
Keywords: second set; definition second; unit; set optical ... See more keywords
Absolute frequency measurements with a robust, transportable 40Ca+ optical clock
Sign Up to like & getrecommendations! Published in 2023 at "Metrologia"
DOI: 10.1088/1681-7575/acd05d
Abstract: We constructed a transportable 40Ca+ optical clock (with an estimated minimum systematic shift uncertainty of 1.3×10−17 and a stability of 5×10−15/τ ) that can operate outside the laboratory. We transported it from the Innovation Academy… read more here.
Keywords: optical clock; frequency; absolute frequency; transportable 40ca ... See more keywords
Geopotential measurement with a robust, transportable Ca+ optical clock
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review A"
DOI: 10.1103/physreva.102.050802
Abstract: We present a robust, transportable ${\mathrm{Ca}}^{+}$ optical clock, with a systematic uncertainty of $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$ limited by the black-body radiation (BBR) field evaluation and an uptime rate of $g75%$ over a 20-day period. The clock is… read more here.
Keywords: clock; geopotential measurement; clock geopotential; optical clock ... See more keywords
Atom Interferometry with the Sr Optical Clock Transition.
Sign Up to like & getrecommendations! Published in 2017 at "Physical review letters"
DOI: 10.1103/physrevlett.119.263601
Abstract: We report on the realization of a matter-wave interferometer based on single-photon interaction on the ultranarrow optical clock transition of strontium atoms. We experimentally demonstrate its operation as a gravimeter and as a gravity gradiometer.… read more here.
Keywords: clock transition; optical clock; interferometry optical; atom interferometry ... See more keywords
An optimized FIR predictor for incomplete measurement data of hydrogen masers relative to an optical clock
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Transactions on Instrumentation and Measurement"
DOI: 10.1109/tim.2023.3279916
Abstract: By considering the observation samples of a hydrogen maser (HM) relative to an optical clock with time-varying variances, this article proposes an optimized predictor based on the finite impulse response (FIR) to improve the predictability… read more here.
Keywords: optical clock; predictor; measurement data; relative optical ... See more keywords
Developing a chip-scale optical clock
Sign Up to like & getrecommendations! Published in 2021 at "Optical Engineering"
DOI: 10.1117/1.oe.60.2.027107
Abstract: Abstract. We report our in-house R&D efforts of designing and developing key integrated photonic devices and technologies for a chip-scale optical oscillator and/or clock. This would provide precision sources to RF-photonic systems. It could also… read more here.
Keywords: optical clock; chip; scale optical; developing chip ... See more keywords
48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock.
Sign Up to like & getrecommendations! Published in 2021 at "Applied optics"
DOI: 10.1364/ao.437473
Abstract: The development of an optical clock with ultimate accuracy and stability requires lasers with very narrow linewidths. We present two ultrastable laser systems based on 48-cm-long Fabry-Perot cavities made of ultralow expansion glass in horizontal… read more here.
Keywords: long room; room temperature; cavities vertical; optical clock ... See more keywords
Proposal for a hybrid clock system consisting of passive and active optical clocks and a fully stabilized microcomb.
Sign Up to like & getrecommendations! Published in 2023 at "Optics express"
DOI: 10.1364/oe.482722
Abstract: Optical atomic clocks produce highly stable frequency standards and frequency combs bridge clock frequencies with hundreds of terahertz difference. In this paper, we propose a hybrid clock scheme, where a light source pumps an active… read more here.
Keywords: hybrid clock; optical clock; active optical; frequency ... See more keywords