It is known that being pumped with infrared light an ensemble of Rb atoms can demonstrate an upconversion and re-emit blue light at 420 nm. In pulsed regime this radiation can be enhanced by collective effects, which is called yoked superradiance. Here we demonstrate that not only the blue-light emission is affected by collective effects, but also the red light scattering. This becomes possible due to the coupling between different non-diagonal elements of the atomic density matrix. We develop a simple self-consistent model of the coupled atom-field system and numerically simulate its dynamics. We test the sensitivity of blue- and red-light pulse profiles on the density of Rb atoms and the background gas pressure.

中文翻译：

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气超辐射超出beyond蒸气的集体辐射效应

众所周知，通过红外光泵浦，Rb原子的整体可以表现出上转换并在420 nm处重新发射蓝光。在脉冲状态下，这种辐射可以通过集体效应来增强，这称为偏转超辐射。在这里，我们证明不仅蓝光发射受集体效应的影响，而且红光散射也受到影响。由于原子密度矩阵的不同非对角元素之间的耦合，这成为可能。我们开发了一个简单的原子场耦合系统的自洽模型，并对其动力学进行了数值模拟。我们测试了蓝光和红光脉冲轮廓对Rb原子密度和背景气压的敏感性。