Precision lifetime measurements on alkali atoms and on helium by beam–gas–laser spectroscopy

Volz, U; Schmoranzer, H.

doi:10.1088/0031-8949/1996/t65/007

Cited by 212 publications

(186 citation statements)

References 43 publications

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“…7 and 8, we plot W ν as a function of wavelength for a number of ro-vibrational levels for sodium and potassium, respectively. The corresponding radiative lifetimes are listed in Tables II and III. They do not differ much from the lifetimes of the excited atoms, 16.3 ns for Na [14,15] and 26.5 ns for K [16], into which the A 2 Π states of the molecules separate with the exception of the v = 4 level of KHe. For the v = 4 level of KHe there occurs what appears to be a chance cancellation in the integration of the dipole matrix element.…”

Section: Resultsmentioning

confidence: 77%

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

2006

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We perform fully quantum mechanical calculations in the binary approximation of the emission and absorption profiles of the sodium 3s-3p and potassium 4s-4p resonance lines under the influence of a helium perturbing gas. We use carefully constructed potential energy surfaces and transition dipole moments to compute the emission and absorption coefficients at temperatures from 158 to 3000 K. Contributions from quasi-bound states are included. The resulting red and blue wing profiles agree well with previous theoretical calculations and with experimental measurements.

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Section: Resultsmentioning

confidence: 77%

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

2006

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“…Indeed, the experimental lifetime measurements noted τ 3/2 and τ 1/2 for np 3/2 and np 1/2 [46,67,68] disagree with the predicted ratio D 3/2 /D 1/2 = √ 2 (see formulas (53) and (54)). This relativistic correction has to be taken into account.…”

Section: B34 Relativistic Correctionmentioning

confidence: 96%

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Comparat

2004

The Journal of Chemical Physics

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NDE (Near-dissociation expansion) including LeRoy-Bernstein formulas are improved by taking into account the multipole expansion coefficients and the non asymptotic part of the potential curve. Applying these new simple analytical formulas to photoassociation spectra of cold alkali atoms, we improve the determination of the asymptotic coefficient, reaching a 1% accuracy, for long-range relativistic potential curve of diatomic molecules.

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“…This rate is equal to half the single-photon Rabi frequency. It is to be compared with γ = 1.9 × 10 7 s −1 [17], which is half the natural decay rate of the excited atomic population and with κ, which is half the decay rate of power in the cavity. The rate κ is related to the cavity finesse F by κ = πc/(2LF ) (c is the speed of light), and hence to the reflectivities of the mirrors [18].…”

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confidence: 99%

Atom Detection and Photon Production in a Scalable, Open, Optical Microcavity

et al. 2007

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A microfabricated Fabry-Perot optical resonator has been used for atom detection and photon production with less than 1 atom on average in the cavity mode. Our cavity design combines the intrinsic scalability of microfabrication processes with direct coupling of the cavity field to singlemode optical waveguides or fibers. The presence of the atom is seen through changes in both the intensity and the noise characteristics of probe light reflected from the cavity input mirror. An excitation laser passing transversely through the cavity triggers photon emission into the cavity mode and hence into the single-mode fiber. These are first steps towards building an optical microcavity network on an atom chip for applications in quantum information processing.PACS numbers: 42.50. Pq, 03.67.Lx, 03.75.Be When a neutral atom is placed in a high-finesse optical cavity, the electric dipole coupling between the atom and the light field can lead to quantum coherence between the two. This fact forms the basis of cavity quantum electrodynamics (QED) [1]. Recently, there has been considerable interest in the possibility of applying cavity QED to problems in quantum information processing, as reviewed, for example, in Ref. [2]. Single photons have been generated on demand from falling [3] and trapped [4] atoms in high-finesse Fabry-Perot cavities, and recent experiments have investigated the cavityassisted generation of single photons from atomic ensembles [5]. These are important steps towards building multiple-cavity quantum information networks, such as those proposed in Ref. [6]. However, experiments so far have been limited to single cavities by the technical demands of achieving high enough finesse. Outstanding challenges now are to make the cavities smaller, to fabricate them in large numbers with the possibility of multiple interconnects, and to load them conveniently and deterministically with atoms. This would pave the way to circuit-model quantum computers [7], to one-way computations based on cluster states [8], and to other schemes requiring multiple cavities [9].As a first move in this direction, two recent experiments have used a small magnetic guide to load atoms into a cavity [10]. However the cavities in these experiments were 2-3 cm long and therefore not more scalable than a conventional Fabry-Perot cavity. By contrast, Aoki et al. have dropped atoms close to a microscopic toroidal cavity and observed evidence of strong coupling [11]. These resonators can be microfabricated in large arrays, however they are not easily used for controlled atom-cavity coupling because of the need to position the atom very precisely in the evanescent field just outside the surface of the resonator. For this reason it is of interest to consider microscopic Fabry-Perot cavities, whose open structure gives access to the central part of the cavity field. In one recent design [12], the two mirrors of such a resonator are formed by optical fibers whose tips have been modified into concave reflectors. This design can achieve small mode...

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Precision lifetime measurements on alkali atoms and on helium by beam–gas–laser spectroscopy

Cited by 212 publications

References 43 publications

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Atom Detection and Photon Production in a Scalable, Open, Optical Microcavity

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