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MON: Monday Contributed Sessions
MON 8: Quantum Sensing and Decoherence: Contributed Session to Symposium I
MON 8.6: Talk
Monday, September 8, 2025, 15:30–15:45, ZHG009
Non-destructive characterization of ceramics using mid-infrared optical coherence tomography with undetected photons — •Felipe Gewers1, Fabian Wendt2, Gunnar Blume3, Emma Pearce1, Martin Laurowski4, Ivan Zorin5, Bettina Heise5, Katrin Paschke3, Helen Chrzanowski1, and Sven Ramelow1, 6 — 1Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany — 2Fraunhofer-Institut für Lasertechnik ILT, Aachen, Germany — 3Ferdinand-Braun-Institut (FBH), Berlin, Germany — 4NELA, Lahr, Germany — 5Research Center for Non-Destructive Testing GmbH, 4040 Linz, Austria — 6IRIS Adlershof, Berlin, Germany
Optical coherence tomography (OCT) is a non-destructive imaging technique widely used in industry and biomedicine. However, imaging ceramic micro-components is challenging due to their strong light scattering. Mid-infrared (mid-IR) wavelengths (2-4µm) can reduce scattering, but conventional OCT systems in this range are expensive, complex, and noisy.
We present a compact, low-cost OCT system based on undetected photons. Using a nonlinear interferometer and a 660nm laser, entangled photon pairs are generated: the sample is probed with mid-IR field (3.3-4.3µm), and detection occurs in the near-infrared (780-820nm) using a standard silicon spectrometer.
Our system accurately measures ceramic thickness and refractive index, and resolves subsurface structures, demonstrating its potential for affordable imaging of highly scattering materials.
Keywords: Optical Coherence Tomography (OCT); Mid-infrared (mid-IR) wavelengths; Nonlinear interferometer; Undetected photons; Ceramic Characterization