arXiv 2002.128222020-02physics.optics

X射线参量下转换：基于改进的实验方法对先前发现的验证

X-ray parametric down-conversion: Challenging previous findings on the basis of improved experimental methods

Christina Boemer, Dietrich Krebs, Michael Diez, Nina Rohringer, Andreas Galler, Christian Bressler

摘要：

X射线参数下转换是一种基本的非线性效应，具有广泛的应用前景。然而，它几乎没有被调查，并且在某些光谱区域仍然缺少明确的证据。特别是，这是下转换成成对的X射线和光学光子的情况，这将打开通道，以激发和成像价电子密度波动。在这项工作中，我们提出了一个系统的方法来扫描参数空间，其中我们希望根据其特征签名来识别效果。在实验装置的分辨率范围内，我们不能建立任何非线性效应的证据。相反，我们跟踪测量的信号回到弹性散射的贡献，从而挑战的解释以前的研究X射线参数下转换产生的光子在可见光谱范围内的效果。作为基准的X射线参数下转换的未来调查-实验和理论-我们提取的效果的转换效率的上限$10^{-11}$内的分辨率，我们的设置。

英文摘要：

X-ray parametric down-conversion is a fundamental nonlinear effect that promises a wide range of possible applications. Nevertheless, it has been scarcely investigated and unequivocal evidence of the effect is still missing for certain spectral regions. In particular, this is the case for down-conversion into pairs of x-ray and optical photons, which would open pathways to characterise and image valence electron-density fluctuations. In this work, we present a systematic approach to scan the parameter space, wherein we expect to identify the effect based on its characteristic signature. Within the resolution of the experimental setup we cannot establish any evidence for the nonlinear effect. Instead, we trace the measured signals back to elastic scattering contributions, thereby challenging the interpretation of previous studies on the effect of x-ray parametric down conversion producing photons in the visible spectral range. As a benchmark for future investigations of x-ray parametric down-conversion - both experimental and theoretical - we extract an upper bound for the effect's conversion efficiency of $10^{-11}$ within the resolution of our setup.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文