The emerging technique of mid-infrared optical coherence tomography (MIR-OCT) takes advantage of the reduced scattering of MIR light in various materials and devices, enabling tomographic imaging at deeper penetration depths. Because of challenges in MIR detection technology, the image acquisition time is, however, significantly longer than for tomographic imaging methods in the visible/near-infrared. Here we demonstrate an alternative approach to MIR tomography with high-speed imaging capabilities. Through femtosecond nondegenerate two-photon absorption of MIR light in a conventional Si-based CCD camera, we achieve wide-field, high-definition tomographic imaging with chemical selectivity of structured materials and biological samples in mere seconds.

中文翻译：

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中红外快速化学选择性 3D 成像


新兴的中红外光学相干断层扫描 (MIR-OCT) 技术利用各种材料和设备中 MIR 光散射减少的优势，实现更深穿透深度的断层成像。然而，由于 MIR 检测技术的挑战，图像采集时间明显长于可见光/近红外断层扫描成像方法。在这里，我们展示了一种具有高速成像功能的 MIR 断层扫描的替代方法。通过传统硅基 CCD 相机中中红外光的飞秒非简并双光子吸收，我们可以在短短几秒钟内实现宽视场、高清断层成像，并具有结构材料和生物样品的化学选择性。