Franke, C.C.FrankeWalther, MartinMartinWaltherHelm, M.M.HelmSchneider, H.H.Schneider2022-03-052022-03-052015https://publica.fraunhofer.de/handle/publica/24240910.1016/j.infrared.2014.08.012Two-photon quantum well infrared photodetectors (QWIPs) are nonlinear detectors for the mid-infrared and terahertz regimes optimized for resonant two-photon absorption. Here we present first results on two-photon QWIP samples based on the GaAs/AIGaAs material system with intersubband energies between 25 and 12 meV (6-3 THz) confirmed by photocurrent spectra. The dark current showed large discontinuities, presumably caused by impact ionization. We performed interferometric autocorrelation experiments at the free-electron laser FELBE and observed nonlinear interferograms for all samples.enquantum well infrared photodetectorQuantum Well Infrared Photodetector (QWIP)interferometric autocorrelationnonlinear optictwo-photon absorption535journal article