Absolute frequency metrology of the CHF3 8.6-µm ro-vibrational spectrum at 10−11 level
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Quantitative Spectroscopy and Radiative Transfer"
DOI: 10.1016/j.jqsrt.2020.106963
Abstract: Abstract An optical-frequency-comb-referenced quantum cascade laser is used to perform wavelength-modulation Lamb-dip spectroscopy on a large number of ro-vibrational transitions falling in the CHF3 υ 5 fundamental band at 8.6 µm. The combined (statistical + systematic) fractional uncertainty… read more here.
Keywords: absolute frequency; spectrum; spectroscopy; frequency metrology ... See more keywords
Absolute frequency measurement of the 1S0–3P0 transition of 171Yb with a link to international atomic time
Sign Up to like & getrecommendations! Published in 2020 at "Metrologia"
DOI: 10.1088/1681-7575/ab50e8
Abstract: We report the absolute frequency measurement of the unperturbed optical clock transition 1S0 – 3P0 in 171Yb performed with an optical lattice frequency standard. Traceability to the International System of Units is provided by a… read more here.
Keywords: frequency measurement; absolute frequency; frequency; link international ... See more keywords
A strontium optical lattice clock with 1 × 10−17 uncertainty and measurement of its absolute frequency
Sign Up to like & getrecommendations! Published in 2020 at "Metrologia"
DOI: 10.1088/1681-7575/abb530
Abstract: We present a measurement of the absolute frequency of the 5s$^2$ $^1$S$_0$ to 5s5p $^3$P$_0$ transition in $^{87}$Sr, which is a secondary representation of the SI second. We describe the optical lattice clock apparatus used… read more here.
Keywords: frequency; lattice clock; uncertainty; absolute frequency ... See more keywords
Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain
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DOI: 10.1088/1681-7575/accbc5
Abstract: We present the new absolute frequency measurement of ytterbium (171Yb) obtained at INRiM with the optical lattice clock IT-Yb1 against the cryogenic caesium (133Cs) fountain IT-CsF2, evaluated through a measurement campaign that lasted 14 months.… read more here.
Keywords: frequency; absolute frequency; measurement optical; frequency measurement ... 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