Haase, Björn ErikBjörn ErikHaaseHennig, JoshuaJoshuaHennigKutas, MircoMircoKutasWaller, ErikErikWallerHering, JulianJulianHeringFreymann, Georg vonGeorg vonFreymannMolter, DanielDanielMolter2023-05-162023-05-162023https://publica.fraunhofer.de/handle/publica/44197110.1364/OE.471837Sensing with undetected photons allows access to spectral regions with simultaneous detection of photons of another region and is based on nonlinear interferometry. To obtain the full information of a sample, the corresponding interferogram has to be analyzed in terms of amplitude and phase, which has been realized so far by multiple measurements followed by phase variation. Here, we present a polarization-optics-based phase-quadrature implementation in a nonlinear interferometer for imaging with undetected photons in the infrared region. This allows us to obtain phase and visibility with a single image acquisition without the need of varying optical paths or phases, thus enabling the detection of dynamic processes. We demonstrate the usefulness of our method on a static phase mask opaque to the detected photons as well as on dynamic measurement tasks as the drying of an isopropanol film and the stretching of an adhesive tape.enquantum-optical measurement principlespontaneous parametric down-conversion (SPDC)nonlinear interferometryDDC::500 Naturwissenschaften und Mathematikjournal article