Statistical uncertainty of 2.5<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>×</mml:mo></mml:math>10<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mrow><mml:mo>−</mml:mo><mml:mn>16</mml:mn></mml:mrow></mml:msup></mml:math>for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mn>199</mml:mn></mml:msup><mml:mn>Hg</mml:mn></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow

Yang, Lin; Mejri, Sinda; Zhang, W.; Manno, Sylvain Di; Abgrall, M.; Guéna, Jocelyne; Coq, Yann Le; Bize, S.

doi:10.1103/physreva.89.043432

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…The lattice light is generated by coupling a frequency doubled titanium-sapphire (Ti:Sa) laser to the vertical Fabry-Perot cavity. The laser is a home made non-planar ring cavity laser and frequency doubling is obtained with a bow-tie enhancement cavity in a lithium triborate (LBO) crystal [17]. A scheme of the lattice laser system is shown in figure 2.…”

Section: Lattice Trapmentioning

confidence: 99%

Comparing a mercury optical lattice clock with microwave and optical frequency standards

et al. 2016

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In this paper we report the evaluation of an optical lattice clock based on neutral mercury with a relative uncertainty of´-1.7 10 16 . Comparing this characterized frequency standard to a 133 Cs atomic fountain we determine the absolute frequency of the  S P Hg Sr 2.629 314 209 898 909 15 with a fractional uncertainty of´-1.8 10 16 is in excellent agreement with a similar measurement obtained by Yamanaka et al (2015 Phys. Rev. Lett. 114 230801). This makes this frequency ratio one of the few physical quantities agreed upon by different laboratories to this level of uncertainty. Frequency ratio measurements of the kind reported in this paper have a strong impact for frequency metrology and fundamental physics as they can be used to monitor putative variations of fundamental constants.

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Section: Lattice Trapmentioning

confidence: 99%

Comparing a mercury optical lattice clock with microwave and optical frequency standards

et al. 2016

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“…An order of magnitude smaller sensitivity to the BBR compared to Sr and Yb clocks [31] makes 199 Hg (nuclear spin 𝐼 = 1/2) a promising candidate for optical lattice clocks [51][52][53] in spite of the required wavelengths in UV region which are relatively difficult in terms of generation and handling. Moreover, because of its large nuclear charge 𝑍 Hg = 80, the clock transition is relatively sensitive ∼ (𝛼𝑍) 2 to the variation of the fine-structure constant 𝛼 among the potential candidates of optical lattice clocks.…”

Section: Mercury Optical Lattice Clockmentioning

confidence: 99%

Frequency ratios of Sr, Yb, and Hg based optical lattice clocks and their applications

Takamoto

Ushijima

Das

et al. 2015

Comptes Rendus. Physique

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This article describes the recent progress of optical lattice clocks with neutral strontium ( 87 Sr), ytterbium ( 171 Yb) and mercury ( 199 Hg) atoms. In particular, we present frequency comparison between the clocks locally via an optical frequency comb and between two Sr clocks at remote sites using a phase-stabilized fibre link. We first review cryogenic Sr optical lattice clocks that reduce the room-temperature blackbody radiation shift by two orders of magnitude and serve as a reference in the following clock comparisons. Similar physical properties of Sr and Yb atoms, such as transition wavelengths and vapour pressure, have allowed our development of a compatible clock for both species. A cryogenic Yb clock is evaluated by referencing a Sr clock. We also report on a Hg clock, which shows one order of magnitude less sensitivity to blackbody radiation, while its large nuclear charge makes the clock sensitive to the variation of fine-structure constant. Connecting all three types of clocks by an optical frequency comb, the ratios of the clock frequencies are determined with uncertainties smaller than possible through absolute frequency measurements. Finally, we describe a synchronous frequency comparison between two Sr-based remote clocks over a distance of 15 km between RIKEN and the University of Tokyo, as a step towards relativistic geodesy.

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“…Optical clock community continues an intensive search for alternative candidates aiming for lower sensitivity to BBR and other shifts, simplicity of manipulation and better accuracy [17,18]. Since hollow-shell lanthanides are expected to show small differential static polarizabilities of the states with different configurations of the 4f electrons, one expects small BBR shift of the innershell magnetic dipole transitions.…”

mentioning

confidence: 99%

Inner-shell magnetic dipole transition in Tm atoms: A candidate for optical lattice clocks

et al. 2016

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We consider a narrow magneto-dipole transition in the 169 Tm atom at the wavelength of 1.14 µm as a candidate for a 2D optical lattice clock. Calculating dynamic polarizabilities of the two clock levels [Xe]4f13 6s 2 (J = 7/2) and [Xe]4f 13 6s 2 (J = 5/2) in the spectral range from 250 nm to 1200 nm, we suggest the "magic" wavelength for the optical lattice at 807 nm. Frequency shifts due to blackbody radiation (BBR), the van der Waals interaction, the magnetic dipole-dipole interaction, and other effects which can perturb the transition frequency are calculated. The transition at 1.14 µm demonstrates low sensitivity to the BBR shift corresponding to 8 × 10 −17 in fractional units at room temperature which makes it an interesting candidate for high-performance optical clocks. The total estimated frequency uncertainty is less than 5 × 10 −18 in fractional units. By direct excitation of the 1.14 µm transition in Tm atoms loaded into an optical dipole trap, we set the lower limit for the lifetime of the upper clock level [Xe]4f 13 6s 2 (J = 5/2) of 112 ms which corresponds to a natural spectral linewidth narrower than 1.4 Hz. The polarizability of the Tm ground state was measured by the excitation of parametric resonances in the optical dipole trap at 532 nm.

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Statistical uncertainty of 2.5×10−16for the199Hg

Cited by 14 publications

References 39 publications

Comparing a mercury optical lattice clock with microwave and optical frequency standards

Comparing a mercury optical lattice clock with microwave and optical frequency standards

Frequency ratios of Sr, Yb, and Hg based optical lattice clocks and their applications

Inner-shell magnetic dipole transition in Tm atoms: A candidate for optical lattice clocks

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