Temperature effects in the relaxation of optically oriented alkali vapours

Minguzzi, P.; Strumia, F.; Violino, P.

doi:10.1007/bf02711418

Cited by 44 publications

(7 citation statements)

References 9 publications

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“…Remarquons que nos hypotheses different de celles adopt6es par P. Minguzzi et al [14] en deux points. Ces auteurs adoptent pour d(5) Q>/dt 1'expression suivante :…”

Section: Equation D'évolution Globale D'une Obser-unclassified

Étude théorique de la relaxation d'atomes alcalins par collisions sur une paroi et sur un gaz

Masnou-Seeuws¹,

Bouchiat²

1967

J. Phys. France

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L'étude théorique présentée a pour but de calculer l'évolution dans le temps de la valeur moyenne d'une observable Q relative à un ensemble d'atomes alcalins dans l'état fondamental, lorsque la relaxation a pour cause les deux processus suivants : d'une part les collisions contre la paroi après diffusion dans le gaz, d'autre part les collisions des atomes alcalins contre les atomes du gaz. Le calcul utilise le formalisme de la matrice densité, ce qui permet de calculer l'évolution de différentes observables et de tenir compte de ce que des observables différentes peuvent relaxer sur la paroi ou sur le gaz avec des constantes de temps différentes. La mise en équation est valable pour une paroi recouverte d'un enduit (collisions faibles de type magnétique) et pour une paroi très désorientante (verre nu ou recouvert d'un miroir alcalin). Cette étude doit permettre d'interpréter les résultats expérimentaux et d'en déduire le coefficient de diffusion de l'alcalin dans le gaz étranger et les sections efficaces de désorientation (alcalin-gaz étranger) relatives à diverses observables. Les rapports entre ces derniers paramètres apportent des renseignements quant à la nature de l'interaction désorientatrice en phase gazeuse et au caractère du spectre de ses fluctuations

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“…Remarquons que nos hypotheses different de celles adopt6es par P. Minguzzi et al [14] en deux points. Ces auteurs adoptent pour d(5) Q>/dt 1'expression suivante :…”

Section: Equation D'évolution Globale D'une Obser-unclassified

Étude théorique de la relaxation d'atomes alcalins par collisions sur une paroi et sur un gaz

Masnou-Seeuws¹,

Bouchiat²

1967

J. Phys. France

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“…It is well known that as a result of the strongly relaxing glass surface, the presence of a buffer gas results in spatial modes for the population imbalance between the two hyperfine manifolds. 17 Consequently, not all spatial regions within the field contribute to the observed line shape to the same degree. Hence, the experimentally observed line shape is a manifestation of two inhomogeneities: one due to the field, and the other due to the equilibrium population imbalance (i.e., the population imbalance between the two states in the absence of the microwave field).…”

Section: Methodsmentioning

confidence: 96%

“…(1). 2 2 However, since atoms in different regions of the cavity experience different microwave-field strengths, and since atomic diffusion through the molecular buffer gas yields spatial modes of hyperfine polarization, 17 the microscopic response to the field varies on the macroscopic scale of the field's and polarization's spatial distributions.…”

Section: Ih Numerical Simulationmentioning

confidence: 99%

Saturation broadening by inhomogeneous fields

Camparo

1989

Phys. Rev. A

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According to the standard Karplus-Schwinger theory of saturation broadening, saturated line shapes are Lorentzians with linewidths that increase linearly with the perturbing field strength. This, however, is not what is observed experimentally when the saturating field is inhomogeneous.If the saturating field strength varies significantly over the experimental signal volume, we find that the saturated line shapes are strikingly non-Lorentzian. The "sharpness" of the experimental line shapes is quantified by an "effective linewidth, " which is the half width at half maximum of a Lorentzian that approximates the experimental line shape near line center. For certain classes of inhomogeneous fields, we find that this effective linewidth increases approximately as the square root of the saturating field strength, rather than linearly. We show that this class of inhomogeneous fields is distinguished by the presence of a node in the field geometry, and that the effect arises because the line shape near line center is dominated by the atomic population in the vicinity of the node. These results indicate the importance of understanding and accounting for inhomogeneous field effects when extracting physical information from experimental line shapes.

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“…As our beam diameter is relatively small compared to the cavity radius, we need only consider the axial spatial varia¬ tions, so that for the spatial variation of the Rabi frequency we have Q(z) = flpeakSin| (16) 023806-3 where L is the cavity length. Though the weighting function W(z) is determined by a complicated interplay between atomic diffusion to the resonance cell walls, where the hyperfine population imbalance is destroyed by wall collisions [17], and the exponential attenuation of the optical pumping rate due to Beer's law absorption in the alkali vapor, for the purposes of the present discussion we consider W(z) to be reasonably well approximated as the simple product of two terms. The first term describes the local "microscopic" in¬ fluence of various parameters on the signal, most notably the optical pumping rate, while the second term accounts for the macroscopic variation of the signal associated with spatial diffusion [18,19], which for simplicity we assume to be well described by the first-order diffusion mode [i.e., sin(7:z/L)]:…”

Section: Inhomogeneous Broadeningmentioning

confidence: 99%

Line shapes of atomic-candle-type Rabi resonances

et al. 2002

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This report has been reviewed by the Public Affairs Office (PAS) and is releasable to the National Technical Information Service (NTIS). At NTIS, it will be available to the general public, including foreign nationals. This technical report has been reviewed and is approved for publication. Publication of this report does not constitute Air Force approval of the report's findings or conclusions. It is published only for the exchange and stimulation of ideas.

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Temperature effects in the relaxation of optically oriented alkali vapours

Cited by 44 publications

References 9 publications

Étude théorique de la relaxation d'atomes alcalins par collisions sur une paroi et sur un gaz

Étude théorique de la relaxation d'atomes alcalins par collisions sur une paroi et sur un gaz

Saturation broadening by inhomogeneous fields

Line shapes of atomic-candle-type Rabi resonances

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