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

机译:多重散射中的相干:冷锶云中传播的弱而强烈的单色光波

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摘要

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:对于大块无序介质,通常通过扩散过程成功地描述了光传输。该图片假定在平均配置下可以消除任何干扰。但是,现在知道,在某些情况下,某些干扰效应会在平均无序状态下幸存下来,进而导致电波局部化效应。在本文中,我们研究了在激光致冷的锶原子的光学厚度样品中传播的单色激光的相干性。为此,我们将相干后向散射效应用作干涉仪。在低的激光探测光束强度下,相位相干得到完全保留,并且干涉对比最大。在较高的强度下,饱和效果开始出现,并且干扰对比度降低。

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