Absolute frequency measurement of mid-infrared secondary frequency standard at BNM-LPTF

Rovera, Daniele; Acef, O.

doi:10.1109/19.769660

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…2). Due to recent recalibration of the standard [67] the results of both older and newer experiments have been shifted and those are now in fair agreement with the great average value. Recently in Paris one more absolute frequency measurement was realized, see ref.…”

Section: Note Added To the Proofmentioning

confidence: 79%

What do we actually know about the proton radius?

Karshenboim¹

1999

Can. J. Phys.

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This paper considers the different determinations of the proton charge radius. It is demonstrates that the results from the elastic electron-proton scattering have to be assigned a higher uncertainty. A review of the hydrogen Lamb-shift measurements and the radius determination from them is also presented.Résumé : Nous comparons ici différentes méthodes pour déterminer le rayon de la distribution de charge du proton. Il appert que la valeur obtenue de la diffusion élastique électron-proton est celle dont la marge d'erreur est la plus grande. Nous étudions aussi les mesures du déplacement de Lamb et la valeur du rayon qu'on peut en déduire. [Traduit par la rédaction] Can. J. Phys. Downloaded from www.nrcresearchpress.com by Entomology on 09/25/12 For personal use only. ©1999 NRC Canada Can. J. Phys. Downloaded from www.nrcresearchpress.com by Entomology on 09/25/12 For personal use only.

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Section: Note Added To the Proofmentioning

confidence: 79%

What do we actually know about the proton radius?

Karshenboim¹

1999

Can. J. Phys.

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“…In 1996, the frequencies of three LD͞Rb lasers, one in the Laboratoire Kastler Brossel (LKB) and two in the Laboratoire Primaire du Temps et des Fréquences (LPTF), were measured with a frequency chain which connected the LD͞Rb laser to the CO 2 ͞OsO 4 standard [4]. More recently, the frequency measurement of this CO 2 ͞OsO 4 standard has been remade with respect to the Cs clock with an uncertainty of 20 Hz (i.e., a relative uncertainty of 7 3 10 213 ) [5]. This last measurement corrects the previous one of the CO 2 ͞OsO 4 standard by 287 Hz.…”

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confidence: 99%

Optical Frequency Measurement of the2S−12DTransitions in Hydrogen and Deuterium: Rydberg Constant and Lamb Shift Determinations

et al. 1999

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We have performed a pure optical frequency measurement of the 2S-12D two-photon transitions in atomic hydrogen and deuterium. From a complete analysis taking into account this result and all other precise measurements (by ourselves and other authors), we deduce optimized values for the Rydberg constant, R` 109 737.315 685 16͑84͒ cm 21 (relative uncertainty of 7.7 3 10 212 ) and for the 1S and 2S Lamb shifts L 1S 8172.837͑22͒ MHz and L 2S-2P 1057.8446͑29͒ MHz [respectively, L 1S 8183.966͑22͒ MHz, and L 2S-2P 1059.2337͑29͒ MHz for deuterium]. These are now the most accurate values available. [S0031-9007(99)09458-2] PACS numbers: 06.20.Jr, 21.10.Ft, 31.30.JvFor many years, Doppler free two-photon spectroscopy has been applied to the hydrogen atom in order to test quantum electrodynamics calculations and to improve the precision of the Rydberg constant R` [1]. Recently, the uncertainty of the measurements has been reduced to a level below 10 211 thanks to optical frequencymultiplication chains, which link the measured frequency via intermediate standard lasers to the caesium clock. With such a chain, Hänsch and co-workers have taken advantage of the small natural width of the 1S-2S twophoton transition (1.3 Hz) to measure this frequency with an uncertainty of 3.4 3 10 213 [2]. In our group, we have made absolute frequency measurements of the 2S-8S͞D transitions with an accuracy better than 8 3 10 212 [3]. In this last case, the precision was limited by the line shape analysis which becomes complicated by a large broadening (up to 1 MHz) due to the inhomogeneous light shift. The comparison of the 1S-2S and 2S-8S͞D measurements has provided very precise determinations of R`and of the Lamb shift [2,3]. Nevertheless, in order to confirm our 2S-8S͞D frequency measurements, we have built a new chain to measure the frequencies of another transition, that is the 2S-12D transition. This transition yields complementary information to our study of the 2S-nS͞nD transitions, because it is very sensitive to stray electric fields (the shift due to the quadratic Stark effect varies as n 7 ), and so such a measurement is a stringent test of Stark corrections to the Rydberg levels.In this Letter, we present these new results and make a complete analysis of the optical frequency measurements to determine the best values for R`and the Lamb shifts.Our new frequency chain uses two standard lasers, a laser diode stabilized on the 5S-5D two-photon transition of rubidium (LD͞Rb laser, l 778 nm, n 385 THz) and a CO 2 laser stabilized to an osmium tetraoxyde line (labeled CO 2 ͞OsO 4 , l ഠ 10 mm, n ഠ 29 THz). In 1996, the frequencies of three LD͞Rb lasers, one in the Laboratoire Kastler Brossel (LKB) and two in the Laboratoire Primaire du Temps et des Fréquences (LPTF), were measured with a frequency chain which connected the LD͞Rb laser to the CO 2 ͞OsO 4 standard [4]. More recently, the frequency measurement of this CO 2 ͞OsO 4 standard has been remade with respect to the Cs clock with an uncertainty of 20 Hz (i.e., a relative uncertainty of...

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“…Thanks to the optical link with the Observatoire de Paris, the DL/Rb standard laser has been simultaneously measured during 300 s in our laboratory and in the LNE-SYRTE laboratory. The result of this test is a frequency difference of 2 (26) Hz, the uncertainty corresponds to one [20,28].…”

Section: Optical Frequency Measurementmentioning

confidence: 99%

Optical frequency measurement of the 1S–3S two-photon transition in hydrogen

et al. 2010

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This article reports the first optical frequency measurement of the 1S−3S transition in hydrogen. The excitation of this transition occurs at a wavelength of 205 nm which is obtained with two frequency doubling stages of a titanium sapphire laser at 820 nm. Its frequency is measured with an optical frequency comb. The second-order Doppler effect is evaluated from the observation of the motional Stark effect due to a transverse magnetic field perpendicular to the atomic beam. The measured value of the 1S 1/2 (F = 1)−3S 1/2 (F = 1) frequency splitting is 2 922 742 936.729 (13)MHz with a relative uncertainty of 4.5×10 −12 . After the measurement of the 1S − 2S frequency, this result is the most precise of the optical frequencies in hydrogen.

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Absolute frequency measurement of mid-infrared secondary frequency standard at BNM-LPTF

Cited by 13 publications

References 9 publications

What do we actually know about the proton radius?

What do we actually know about the proton radius?

Optical Frequency Measurement of the2S−12DTransitions in Hydrogen and Deuterium: Rydberg Constant and Lamb Shift Determinations

Optical frequency measurement of the 1S–3S two-photon transition in hydrogen

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