Oscillator strengths and radiative branching ratios in atomic Sr

Werij, H. G. C.; Greene, Chris H.; Theodosiou, Constantine E.; Gallagher, Alan

doi:10.1103/physreva.46.1248

Cited by 67 publications

(46 citation statements)

References 36 publications

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“…Therefore, we took this rate as a fitting parameter to locate the magic wavelength at 914 nm. The estimated transition rate of A = 8.5 × 10 7 /s was within the reported values in the range of 6.7 − 9.2 × 10 7 /s [22]. Using the value, we calculated the differential Stark shifts shown by the solid lines in Fig.…”

Section: Lamb Dicke Spectroscopymentioning

confidence: 96%

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Recoil-Free Spectroscopy of Neutral Sr Atoms in the Lamb-Dicke Regime

2003

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We have demonstrated a recoil-free spectroscopy on the 1 S0 − 3 P1 transition of strontium atoms confined in a one-dimensional optical lattice. By investigating the wavelength and polarization dependence of the ac Stark shift acting on the 1 S0 and 3 P1(mJ = 0) states, we determined the magic wavelength where the Stark shifts for both states coincide. The Lamb-Dicke confinement provided by this Stark-free optical lattice enabled the measurement of the atomic spectrum free from Doppler as well as recoil shifts.PACS numbers: 32.80. Pj, 32.30.Jc, 32.60.+i, 32.70.Jz Recent dramatic advances in optical metrology have made it possible to directly link two optical frequencies with an uncertainty below 10 −18 [1] and to coherently divide an optical frequency down to a radio frequency defined by the SI second [2]. Owing to these techniques, a stringent comparison of the stability and accuracy among optical clocks becomes feasible [3] and leads to an improved definition of time and a test of the time variation of a fundamental constant [4]. Up to now, two sorts of absorbers, single ions in the Lamb-Dicke regime (LDR) [5] and neutral atoms in free space, have been extensively studied for optical clocks. Tightly confined single ions, enabling a long interaction time and the Doppler-as well as the recoil-free absorption [6], have, so far, led to the narrowest optical spectrum [7]. However, the stability was severely limited by the quantum projection noise (QPN) [8] of the single absorber. The ensemble of neutral atoms, in contrast, provides a far better QPN limit. The accuracy of the measurement is known to be affected by the atomic motion, as residual Doppler shifts are introduced through the imperfect wave front of the probe beam [9,10].These two approaches could merge if an ensemble of neutral atoms were separately prepared in the LDR. An optical lattice made by the interference pattern of a light field [11] confines atoms in a small volume, which satisfies the Lamb-Dicke condition [5]. However, an impediment for the precision measurement is the complete control over the perturbations caused by this container, since the Stark shift potential strongly depends on the electronic state, which is not the case for ion-trapping potential.The transition frequency between the states, |g and |e , subjected to the ac Stark shift of the trap laser with * Current address: JILA, University of Colorado, CO 80309-0440.† Author to whom correspondence should be addressed. E-mail address: katori@amo.t.u-tokyo.ac.jp an electric field of E(ω L ,ǫ), can be written as,Here, ω e −ω g (= ω 0 ) is the unperturbed atomic resonance frequency, anddenotes the differential dipole-polarizability. If the polarizabilities α e and α g coincide at a specific trapping laser frequency ω L and polarizationǫ, the second term of Eq. (1) vanishes. Therefore, the unperturbed atomic transition frequency, independent of the trapping laser intensity of I L ∝ | E| 2 , can be observed [12,13]. This Stark shift cancellation technique was first demonstrated by an impr...

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Section: Lamb Dicke Spectroscopymentioning

confidence: 96%

“…Among the transition strengths listed in Ref. [22], the (5s6s) 3 S → (5s5p) 3 P transition rate showed a rather large discrepancy of more than 30 %. Therefore, we took this rate as a fitting parameter to locate the magic wavelength at 914 nm.…”

Section: Lamb Dicke Spectroscopymentioning

confidence: 99%

Recoil-Free Spectroscopy of Neutral Sr Atoms in the Lamb-Dicke Regime

2003

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“…have been measured [35,36]. The ratio of these transition rates can be used to make an estimate of the singlet:triplet mixing between the two 5s6p states with J = 1.…”

Section: Formulationmentioning

confidence: 99%

Tune-out wavelengths for the alkaline-earth-metal atoms

2013

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The lowest 3 tune-out wavelengths of the four alkaline-earth atoms, Be, Mg, Ca and Sr are determined from tabulations of matrix elements produced from large first principles calculations. The tune-out wavelengths are located near the wavelengths for 3 P o 1 and 1 P o 1 excitations. The measurement of the tune-out wavelengths could be used to establish a quantitative relationship between the oscillator strength of the transition leading to existence of the tune-out wavelength and the dynamic polarizability of the atom at the tune-out frequency. The longest tune-out wavelengths for Be, Mg, Ca, Sr, Ba and Yb are 454.9813 nm, 457.2372 nm, 657.446 nm, 689.200 nm, 788.875 nm and 553.00 nm respectively.

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“…However, typically the literature gives the total transition rate A T from a given excited state to the fine structure manifold states below. So we need establish the relation [25], b [26], c [27], d [28], e [29], f [30], g [31]. [33].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…After calculating magic wavelengths for Sr and Ca optical clock transitions and comparing them to the experimental values, we calculate the polarizability of terahertz transition with data collection mainly from Ref. [20,[25][26][27][28][29][30][31][32].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

Magic wavelengths for terahertz clock transitions

Zhou

Chen

et al. 2010

Phys. Rev. A

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Magic wavelengths for laser trapping of boson isotopes of alkaline-earth Sr, Ca and Mg atoms are investigated while considering terahertz clock transitions between the 3 P 0 , 3 P 1 , 3 P 2 metastable triplet states. Our calculation shows that magic wavelengths of trapping laser do exist. This result is important because those metastable states have already been used to realize accurate clocks in the terahertz frequency domain. Detailed discussions for magic wavelength for terahertz clock transitions are given in this paper.

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Oscillator strengths and radiative branching ratios in atomic Sr

Cited by 67 publications

References 36 publications

Recoil-Free Spectroscopy of Neutral Sr Atoms in the Lamb-Dicke Regime

Recoil-Free Spectroscopy of Neutral Sr Atoms in the Lamb-Dicke Regime

Tune-out wavelengths for the alkaline-earth-metal atoms

Magic wavelengths for terahertz clock transitions

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