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We report a proof-of-concept demonstration of a tunable infrared (IR) opticalcoherence tomography (OCT) technique with detection of only visible rangephotons. Our method is based on the nonclassical interference of frequencycorrelated photon pairs. The nonlinear crystal, introduced in theMichelson-type interferometer, generates photon pairs with one photon in thevisible and another in the IR range. The intensity of detected visible photonsdepends on the phase and loss of IR photons, which interact with the sampleunder study. This enables us to perform imaging and characterize sampleproperties in the IR range by detecting visible photons. The techniquepossesses broad tunability and yields a fair axial and lateral resolution. Thework contributes to the development of versatile 3D imaging and materialcharacterization systems working in a broad range of IR wavelengths, which donot require the use of IR-range equipment.

Tunable Optical Coherence Tomography in the Infrared Range Using Visible Photons