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Collective atomic scattering and motional effects in a dense coherent medium
Atomic Physics · Submitted 20 Jan 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The measurements are reproduced with a theoretical model treating the atoms as coherent, interacting, radiating dipoles.
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
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The abstract, sentence by sentence
We investigate collective emission from coherently driven ultracold $ ^{88} $ Sr atoms. We perform two sets of experiments, using a strong and weak transition that are insensitive and sensitive, respectively, to atomic motion at one microKelvin. We observe highly directional forward emission with a peak intensity that is enhanced, for the strong transition, by > $ 10 ^3 $ compared to that in the transverse direction. This is accompanied by substantial broadening of spectral lines. For the weak transition, the forward enhancement is substantially reduced due to motion. Meanwhile, a density-dependent frequency shift of the weak transition (~10% of the natural linewidth) is observed. In contrast, this shift is suppressed to <1% of the natural linewidth for the strong transition. Along the transverse direction, we observe strong polarization dependences of the fluorescence intensity and line broadening for both transitions. The measurements are reproduced with a theoretical model treating the atoms as coherent, interacting, radiating dipoles.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We investigate collective emission from coherently driven ultracold $ ^{88} $ Sr atoms. | contribution 0.98 | 0.90 | 0.04 | asserted 0.72 |
| s1 | We perform two sets of experiments, using a strong and weak transition that are insensitive and sensitive, respectively, to atomic motion at one microKelvin. | method 0.99 | 0.96 | 0.03 | asserted 0.96 |
| s2 | We observe highly directional forward emission with a peak intensity that is enhanced, for the strong transition, by > $ 10 ^3 $ compared to that in the transverse direction. | result 1.00 | 0.96 | 0.30 | asserted 1.00 |
| s3 | This is accompanied by substantial broadening of spectral lines. | result 1.00 | 0.92 | 0.08 | asserted 1.00 |
| s4 | For the weak transition, the forward enhancement is substantially reduced due to motion. | result 1.00 | 0.94 | 0.12 | asserted 1.00 |
| s5 | Meanwhile, a density-dependent frequency shift of the weak transition (~10% of the natural linewidth) is observed. | result 1.00 | 0.95 | 0.11 | asserted 1.00 |
| s6 | In contrast, this shift is suppressed to <1% of the natural linewidth for the strong transition. | result 1.00 | 0.93 | 0.11 | asserted 1.00 |
| s7 | Along the transverse direction, we observe strong polarization dependences of the fluorescence intensity and line broadening for both transitions. | result 1.00 | 0.96 | 0.08 | asserted 1.00 |
| s8 | The measurements are reproduced with a theoretical model treating the atoms as coherent, interacting, radiating dipoles. | method 0.53 | 0.88 | 0.18 | asserted 1.00 |
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Original abstract
We investigate collective emission from coherently driven ultracold $ ^{88} $ Sr atoms. We perform two sets of experiments, using a strong and weak transition that are insensitive and sensitive, respectively, to atomic motion at one microKelvin. We observe highly directional forward emission with a peak intensity that is enhanced, for the strong transition, by > $ 10 ^3 $ compared to that in the transverse direction. This is accompanied by substantial broadening of spectral lines. For the weak transition, the forward enhancement is substantially reduced due to motion. Meanwhile, a density-dependent frequency shift of the weak transition (~10% of the natural linewidth) is observed. In contrast, this shift is suppressed to <1% of the natural linewidth for the strong transition. Along the transverse direction, we observe strong polarization dependences of the fluorescence intensity and line broadening for both transitions. The measurements are reproduced with a theoretical model treating the atoms as coherent, interacting, radiating dipoles.
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5 arXiv papers cite this in 7 sentences
Papers citing it · 2 sentences without a confident label
Cites it as background 4 papers
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Here, the exchange of virtual photons results in induced dipole-dipole interactions [ref] and collective Lamb and Lorentz-Lorenz shifts [ref] .
Subradiance-protected excitation transport · Introduction · 0.81
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More generally, collective interactions mediated by the 7.5 kHz linewidth dipole-forbidden $^3$P$_1$ to $^1$S$_0$ transition in $^88$Sr have been studied in the context of lasing, cavity QED, and collective scattering [ref] .
Superradiance on the milliHertz linewidth strontium clock transition · Introduction: · 0.97
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Collective light scattering from a coherently driven ensemble of atoms is a research area of long standing [ref] , but the phenomenon remains the subject of considerable current interest e.g. Refs. [ref] .
Analytic solutions for the spatial character and coherence properties of light scattered from two dipole-coupled atoms · Introduction · 1.00
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