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High resolution mid-infrared optical coherence tomography with kHz line rate
preprintposted on 2023-01-11, 22:55 authored by Niels M. Israelsen, Peter John Rodrigo, Christian R. Petersen, Getinet Woyessa, Rasmus E. Hansen, Peter Tidemand-Lichtenberg, Christian Pedersen, Ole Bang
We report on Mid-infrared (MIR) OCT at 4 $\mu$m based on collinear sum-frequency upconversion and promote the A-scan scan rate to 3 kHz. We demonstrate the increased imaging speed for two spectral realizations, one providing an axial resolution of 8.6 $\mu$m, and one providing a record axial resolution of 5.8 $\mu$m. Image performance is evaluated by sub-surface micro-mapping of a plastic glove and real-time monitoring of CO$_2$ in parallel with OCT imaging.