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20 May 2011 Quantum cascade laser as a mid-infrared photovoltaic and photoconductive detector
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We report the operation of quantum cascade lasers (QCLs) as a mid-infrared (mid-IR) photo-detector under both photovoltaic and photoconductive modes. When operated at photoconductive mode, negative photo-conductance is observed at low bias current. The photo-conductance of the device changes from negative to positive when the bias is increased over a transparency point. These interesting mid-IR detection characteristics of QCL gain material can help and simplify the design and testing of mid-IR photonic integrated devices and circuits by using them to measure the coupling and waveguide loss and provide gain at any location in a mid-IR photonic circuit.
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Xing Chen, David Shyu, Fow-Sen Choa, and Sudhir Trivedi "Quantum cascade laser as a mid-infrared photovoltaic and photoconductive detector", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80123N (20 May 2011);

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