Remote frequency measurement of the1S0→3P1transition in laser-cooled24Mg

Friebe, J.; Riedmann, M.; Wübbena, T.; Pape, A.; Kelkar, Hrishikesh; Ertmer, W.; Terra, Osama; Sterr, U.; Weyers, S.; Grosche, G.; Schnatz, H.; Rasel, Ernst M.

doi:10.1088/1367-2630/13/12/125010

Cited by 29 publications

(22 citation statements)

References 28 publications

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“…The better performance has been obtained by transferring an ultra-stable optical frequency around 1.55 µm [2]. Optical frequency transfer has been demonstrated by several groups on distances up to a few hundreds of km [2][3][4][5][6] and used for clocks frequency comparison [7][8][9][10]. Record optical links of 920 km and 1840 km were demonstrated in Germany with a frequency transfer stability (modified Allan deviation) of 3-5x10 -15 at 1 s averaging time and below 10 -18 after a few hundred of s [11,12].…”

Section: Introductionmentioning

confidence: 99%

In-line extraction of an ultrastable frequency signal over an optical fiber link

et al. 2014

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Received Month X, XXXX; revised Month X, XXXX; accepted Month X, XXXX; posted Month X, XXXX (Doc. ID XXXXX); published Month X, XXXX We demonstrate in-line extraction of an ultra-stable frequency signal over an optical link of 92-km of installed telecommunication fibers, following the proposition of G. Grosche in 2010 [1]. We show that the residual frequency noise at the extraction end is noticeably below that at the main link output when the extraction is near the input end, as expected from a simple model of the noise compensation. We obtain relative frequency instabilities, expressed as overlapping Allan deviation, of 8×10 -16 at 1 s averaging time and a few 10 -19 at 1 day. These results are at the state-of-the-art for a link using urban telecommunication fibers. We also propose an improved scheme which delivers an ultra-stable signal of higher power, in order to feed a secondary link. In-line extraction opens the way to a broad distribution of an ultra-stable frequency reference, enabling a wide range of applications beyond metrology.

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Section: Introductionmentioning

confidence: 99%

In-line extraction of an ultrastable frequency signal over an optical fiber link

et al. 2014

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“…2) and demonstrated a 172-km link using recirculation in the same fibres [23]. Following these pioneering results, several groups worldwide have initiated experiments on optical links [24,27,28,[30][31][32][46][47][48].…”

Section: Ultra-stable Optical Frequency Transfer On Long-haul Fibre Lmentioning

confidence: 99%

Frequency and time transfer for metrology and beyond using telecommunication network fibres

Lopez

Kéfélian

Jiang

et al. 2015

Comptes Rendus. Physique

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The distribution and the comparison of an ultra-stable optical frequency and accurate time using optical fibres have been greatly improved in the last ten years. The frequency stability and accuracy of optical links surpass well-established methods using the global navigation satellite system and geostationary satellites. In this paper, we present a review of the methods and the results obtained. We show that public telecommunication network carrying Internet data can be used to compare and distribute ultra-stable metrological signals over long distances. This novel technique paves the way for the deployment of a national and continental ultra-stable metrological optical network. RésuméLa distribution et la comparaison d'étalons de fréquence optique ultra-stables et d'échelle de temps ont été grandement améliorées depuis dix ans par l'emploi de fibres optiques. La stabilité de fréquence et l'exactitude des liens optiques fibrés surpassent les méthodes bien établies fondées sur les communications satellitaires. Dans cet article, nous présentons les méthodes et les résultats obtenus pendant cette décade. Nous montrons que les réseaux de télécommunication publics transportant des données internet peuvent être utilisés pour comparer et distribuer des signaux métrologiques sur de grandes distances. Ceci ouvre la voie au déploiement d'un réseau métrologique à l'échelle nationale et continentale.

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“…Ones of the main candidates for producing the newgeneration frequency standards are alkaline earth and alkaline-earth-like atoms: Yb (for instance, see [21][22][23]), Ca [24], Sr [18,19,25], Hg [26] and Mg [27,28]. These atoms are the most appropriate because of narrow spectroscopic lines due to forbidden optical transitions from the ground state 1 S 0 to the lowest excited triplet state 3 P 0,1,2 (see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…It consists in absence of optical pumping of atoms on the non-resonant level 3 1 D 2 during the realization of laser precooling with the help of strong dipole transition 3 1 S 0 →3 1 P 1 (see Fig. 1) to reach the temperature down to a few millikelvins [27,28,44,45].…”

Section: Introductionmentioning

confidence: 99%

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

et al. 2015

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The problem of deep laser cooling of 24 Mg atoms is theoretically studied. We propose two-stage sub-Doppler cooling strategy using electro-dipole transition 3 3 P2→3 3 D3 (λ = 383.9 nm). The first stage implies exploiting magneto-optical trap with σ + and σ − light beams, while the second one uses a lin⊥lin molasses. We focus on achieving large number of ultracold atoms (T ef f <10 µK) in a cold atomic cloud. The calculations have been done out of many widely used approximations and based on quantum treatment with taking full account of recoil effect. Steady-state average kinetic energies and linear momentum distributions of cold atoms are analyzed for various light field intensities and frequency detunings. The results of conducted quantum analysis have revealed noticeable differences from results of semiclassical approach based on the Fokker-Planck equation. At certain conditions the second cooling stage can provide sufficiently lower kinetic energies of atomic cloud as well as increased fraction of ultracold atoms than the first one. We hope that the obtained results can assist overcoming current experimental problems in deep cooling of 24 Mg atoms by means of laser fields. Cold magnesium atoms, being cooled in large number down to several µK, have certain interest, for example, in quantum metrology.

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Remote frequency measurement of the¹S₀→³P₁transition in laser-cooled²⁴Mg

Cited by 29 publications

References 28 publications

In-line extraction of an ultrastable frequency signal over an optical fiber link

In-line extraction of an ultrastable frequency signal over an optical fiber link

Frequency and time transfer for metrology and beyond using telecommunication network fibres

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

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