Multimodal mid-infrared optical coherence tomography and spectroscopy for non-destructive testing and art diagnosis

摘要

Novel types of supercontinuum sources radiating in the infrared (IR) spectral region provide ultra-broadbandspectral coverage and maintain distinctive laser-like properties of emission such as brightness, spatial coherenceand high power. Being a perfectly suitable light source for mid-infrared optical coherence tomography (OCT)and spectroscopy, supercontinuum sources initiated a signicant amount of recent developments in these eldsand promise to be a gamechanging factor in the nearest future. In this paper, we exhibit a simple, optimized andrelatively cost-eective system operating in near and mid-infrared ranges and combining OCT and co-registeredIR spectroscopy. The performance of the OCT modality of the setup is evaluated with respect to the sensitivityand roll-o. Due to reduced scattering inherited with the new spectral window, we achieve the enhancement inthe penetration depth in articial paintings, ceramics and pottery. Furthermore, the hyperspectral data is usedto supplement structural information and access to the chemical composition of the sample. The gained resultsreveal the potential of the multimodal system for non-destructive testing, art and cultural objects diagnosis.