Rydberg states of excitons can reach microns in size and require extremely pure crystals. We introduce an experimental method for the rapid and spatially resolved characterization of Rydberg excitons in copper oxide (${\mathrm{Cu}}_2\mathrm{O}$) with submicron resolution over large zones. Our approach involves illuminating and imaging the entire sample on a camera to realize a spatially resolved version of resonant absorption spectroscopy, without any mobile part. This yields spatial maps of Rydberg exciton properties, including their energy, linewidth, and peak absorption, providing a comprehensive quality assessment of the entire sample in a single shot. Furthermore, by imaging the sample photoluminescence over the same zone, we establish a strong relationship between the spectral quality map and the photoluminescence map of charged oxygen vacancies. This results in an independent, luminescence-based quality map that closely matches the results obtained through resonant spectroscopy. Our findings reveal that Rydberg excitons in natural ${\mathrm{Cu}}_2\mathrm{O}$ crystals are predominantly influenced by optically active charged oxygen vacancies, which can be easily mapped. Together, these two complementary methods provide valuable insights into ${\mathrm{Cu}}_2\mathrm{O}$ crystal properties.

中文翻译：

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通过里德伯激子大规模表征 Cu2O 单晶

激子的里德伯态尺寸可达微米级，需要极其纯净的晶体。我们介绍了一种快速、空间分辨表征氧化铜中里德伯激子的实验方法（${铜}_2\mathrm{氧}$）在大区域内具有亚微米分辨率。我们的方法涉及在相机上对整个样品进行照明和成像，以实现共振吸收光谱的空间分辨版本，无需任何移动部件。这会产生里德伯激子特性的空间图，包括它们的能量、线宽和峰值吸收，从而一次性对整个样品进行全面的质量评估。此外，通过对同一区域上的样品光致发光进行成像，我们在光谱质量图和带电氧空位的光致发光图之间建立了牢固的关系。这产生了一个独立的、基于发光的质量图，与通过共振光谱获得的结果非常匹配。我们的研究结果表明，自然中的里德伯激子${铜}_2\mathrm{氧}$晶体主要受光学活性带电氧空位的影响，可以轻松绘制。这两种互补的方法共同提供了宝贵的见解${铜}_2\mathrm{氧}$晶体特性。