Quadratic detection with two-photon quantum well infrared photodetectors |
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| Authors: | H. Schneider H.C. Liu S. Winnerl C.Y. Song O. Drachenko M. Walther J. Faist M. Helm |
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| Affiliation: | 1. Department of Clinical Microbiology and Infectious Diseases, Hadassah–Hebrew University Medical Center, POB 12000, 91120 Jerusalem, Israel;2. Internal Medicine Department, Hadassah–Hebrew University Medical Center, Jerusalem, Israel;3. Heart Institute and Department of Medicine, Hadassah–Hebrew University Medical Center, Jerusalem, Israel;1. Department of Internal Medicine, Collagen and Minoritarian Diseases, Virgen del Rocio Hospital, Seville, Spain;2. Department of Allergy and Clinical Immunology, Respiratory Institute, Cleveland Clinic Foundation, Cleveland, OH, USA |
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| Abstract: | Two-photon quantum well infrared photodetectors (QWIPs) involving three equidistant subbands take advantage of a resonantly enhanced optical nonlinearity, which is six orders of magnitude stronger than in a bulk semiconductor. This approach results in a sensitive device to measure quadratic autocorrelation of mid-infrared optical pulses from modelocked quantum cascade lasers, nonlinear optical conversion, and free-electron lasers (FEL). We report on autocorrelation measurements at wavelengths in the mid-infrared and Terahertz regimes using ps optical pulses from the FEL at the Forschungszentrum Dresden Rossendorf. In particular, quadratic detection at wavelengths around 5.5 μm is still possible at room-temperature, which is crucial for applications in practical systems. We also report on a two-photon detector which works below the Reststrahlen band at 42 μm (7.1 THz). |
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