Optical coherence tomography (OCT) is a high-resolution three-dimensional imaging technique that enables nondestructive measurements of surface and subsurface microstructures. Recent developments of OCT operating in the mid-infrared (MIR) range (around 4 µm) lifted fundamental scattering limitations and initiated applied material research in formerly inaccessible fields. The MIR spectral region, however, is also of great interest for spectroscopy and hyperspectral imaging, which allow highly selective and sensitive chemical studies of materials. In this contribution, we introduce an OCT system (dual-band, central wavelengths of 2 µm and 4 µm) combined with MIR spectroscopy that is implemented as a raster scanning chemical imaging modality. The fully integrated and cost-effective optical instrument is based on a single supercontinuum laser source (emission spectrum spanning from 1.1 µm to 4.4 µm). Capabilities of the in situ correlative measurements are experimentally demonstrated by obtaining complex multidimensional material data, comprising morphological and chemical information, from a multilayered composite ceramic-polymer specimen.

中文翻译：

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相关的红外光学相干断层扫描和高光谱化学成像。

光学相干断层扫描（OCT）是高分辨率的三维成像技术，可对表面和亚表面微结构进行无损测量。OCT在中红外（MIR）范围（大约4 µm）范围内的最新发展取消了基本的散射限制，并开始了在以前无法进入的领域中的应用材料研究。然而，MIR光谱区域对于光谱学和高光谱成像也引起了极大的兴趣，这允许对材料进行高度选择性和敏感的化学研究。在这项贡献中，我们介绍了一种结合了MIR光谱学的OCT系统（双波段，中心波长为2 µm和4 µm的中心波长），该系统被实现为光栅扫描化学成像方法。完全集成且具有成本效益的光学仪器基于单个超连续谱激光源（发射光谱范围为1.1 µm至4.4 µm）。的能力通过从多层复合陶瓷-聚合物样品中获得复杂的多维材料数据（包括形态和化学信息），通过实验证明了原位相关测量。