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Phase coherence in multiple scattering : weak and intense monochromatic light wave propagating in a cold strontium cloud

机译:多种散射中的相干性:在冷锶云中传播弱和强烈的单色光波

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For large bulk disordered media, light transport is generally successfully described by a diffusion process. This picture assumes that any interference is washed out under configuration average. However, it is now known that, under certain circumstances, some interference effects survive the disorder average and in turn lead to wave localizations effects. In this paper, we investigate coherence of a monochromatic laser light propagating in an optically thick sample of laser-cooled strontium atoms. For this purpose, we use the coherent backscattering effect as an interferometric tool. At low laser probe beam intensities, phase coherence is fully preserved and the interference contrast is maximal. At higher intensities, saturation effects start to set in and the interference contrast is reduced.
机译:对于大散装无序介质,通常通过扩散过程成功地描述光传输。该图片假设在配置平均值下冲出任何干扰。然而,现在已知,在某些情况下,一些干扰效果在紊乱的平均值生存并又导致波浪本地化效果。在本文中,我们研究了在激光冷却锶原子的光学厚样品中传播的单色激光的相干性。为此目的,我们使用相干的反向散射效应作为干涉式工具。在低激光探针光束强度下,完全保持相位相干性,干扰对比度最大。在更高的强度下,饱和效果开始设定,干扰对比度降低。

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