Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.39: Poster

Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer

Optical Coherence Tomography with Undetected Photons Based on an Integrated PDC Source — •Franz Roeder, René Pollmann, Michael Stefszky, Victor Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn

Interferometry allows us to perform phase measurements with high precision to gain information about a system of interest, e.g., in a classical Mach-Zehnder interferometer. Replacing passive beam splitters of a Mach-Zehnder interferometer with active elements, such as parametric down-conversion (PDC) sources yields a so-called SU(1,1) interferometer. By operating the SU(1,1) interferometer with two non-degenerate wavelengths, for instance in the mid-IR and visible, it becomes possible to retrieve the phase properties of an object interacting with the mid-IR light by measuring only the visible light.
Here, we utilize broadband non-degenerate type-II PDC in dispersion engineered periodically poled lithium niobate waveguides as active elements of such an interferometer, which brings the benefit of significantly reduced energy consumption for a given signal-to-noise ratio, and demonstrate optical coherence tomography (OCT) with undetected photons. Furthermore, we investigate the conditions for an optimized signal-to-noise ratio by compensating for losses in the interferometer in a differential pumping scheme.