A swept-source optical coherence tomography (OCT) system is demonstrated in the mid-infrared region. A Michelson interferometric setup is illuminated by an external cavity quantum cascade laser (QCL), with a scanning frequency of 1 Hz. A-scans were collected using three different samples: a mirror, CaF2 coated with germanium on both of its surfaces, and CaF2 coated with germanium on the back side of the sample. These depth-profiles were used to mimic a tissue sample with multiple reflective boundaries. Fourier transformation of these interference fringes clearly showed the expected depths of reflection, allowing for the signal to noise ratio of the system to be determined.
S. Freer, D. G. Revin, K. Groom, and S. J. Matcher, "Towards swept-source mid-infrared OCT," Proc. SPIE 10685, Biophotonics: Photonic Solutions for Better Health Care VI, 106851W (Presented at SPIE Photonics Europe: April 25, 2018; Published: 17 May 2018); https://doi.org/10.1117/12.2306911.
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