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arXiv 1908.05260physics.atom-ph
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冷高斯原子云的光子散射

Photon scattering from a cold, Gaussian atom cloud

F. Robicheaux, R. T. Sutherland

摘要:

研究了弱驱动原子云的偏振分布对其光子散射线形的影响。在这样做时,我们发现三个不同的极化制度。首先,对于稀释云,偏振强度是相对恒定的。其次,对于密度较大的云,偏振在云的前部建立,以获得近共振光。第三,当云凝结到其尺寸与波长相当的程度时,光重新聚焦到云的背面,从而产生红色失谐。对于这些制度,我们展示了“平均场”框架准确地描述了不同的光子散射线型。最后,对于更密集的云,平均场模型变得不准确,需要包括原子-原子相关的全点偶极子模型。

英文摘要:

We study the effect of a weakly driven atomic cloud's polarization distribution on its photon scattering lineshape. In doing this, we find three distinct polarization regimes. First, for dilute clouds, the polarization magnitude is relatively constant. Second, for denser clouds, polarization builds at the front of the cloud for near-resonant light. Third, when the cloud condenses to the point where its dimensions become comparable to the wavelength, light refocuses towards the back of the cloud for red detuning. For these regimes, we show which `mean-field' frameworks accurately describe the differing photon scattering lineshapes. Finally, for even denser clouds, mean field models become inaccurate and necessitate the full point dipole model that includes atom-atom correlations.

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