Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum Effects IV
Q 66.3: Vortrag
Freitag, 18. März 2022, 11:00–11:15, Q-H13
Investigation of incoherent-seeding effects on performance of nonlinear interferometers — •Björn Haase1,2, Joshua Hennig1,2, Mirco Kutas1,2, Georg von Freymann1,2, and Daniel Molter1 — 1Fraunhofer Institute for Industrial Mathematics, Kaiserslautern, Germany — 2Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany
In the last decade, measurement techniques with undetected photons have undergone remarkable improvements and their potential has been demonstrated for various spectral ranges like the infrared or terahertz frequency range. This effect is based on the interference of biphotons which are generated in nonlinear crystals. In those interferometers solely the interference of the signal photons generated in one of the crystals is detected while the correlated idler radiation interacts with a sample. If both the signal and idler are aligned the sample’s information can be transferred from the idler to the signal photons which are easier to detect. Yet, if the idler photon energy is very small thermal idler radiation present at room temperature has to be considered. To simulate this kind of radiation we added an incoherent seed to a nonlinear Mach-Zehnder interferometer setup used in the original work [Lemos et al., Nature 512, 409, (2014)] to evaluate its influence on the performance of nonlinear interferometers. Here, 532-nm pump photons decay into signal and idler photons at 810 nm and 1550 nm due to DFG with the incoherent seed or SPDC with vacuum fluctuations. I will present the findings, that might be useful to enhance the applicability in spectral regions suffering from insufficient sensor sensitivity.