Kumar, M.M.KumarKumar, P.P.KumarVega, A.A.VegaWeissflog, M.A.M.A.WeissflogPertsch, T.T.PertschSetzpfandt, F.F.Setzpfandt2022-05-062022-05-062021https://publica.fraunhofer.de/handle/publica/41587710.1063/5.00740542-s2.0-85121548926We demonstrate nondegenerate photon pair generation by spontaneous parametric downconversion in a silver gallium sulfide AgGaS2 crystal. By tuning the pump wavelength, we achieve phase matching over a large spectral range. This allows to generate idler photons in the mid-infrared spectral range above a 6 mm wavelength with corresponding signal photons in the visible. Also, we show photon pair generation with broad spectral bandwidth. These results are a valuable step toward the development of quantum imaging and sensing techniques in the mid-infrared.eninfrared devicesphase matchingPhotonssilver compoundsulfur compound620621journal article