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Single-photon avalanche diode
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== Applications == Since the 1970s, the applications of SPADs have increased significantly. Recent examples of their use include [[LIDAR]], [[time-of-flight camera|time of flight]] (ToF) 3D imaging, [[Positron emission tomography|PET scanning]], single-photon experimentation within physics, [[Fluorescence-lifetime imaging microscopy|fluorescence lifetime]] microscopy, optical communications (particularly [[quantum key distribution]]), and digital [[night vision]].<ref name="u359">{{cite web |title=SPAD Sensor β Long-Range Night Vision |url=https://www.canon.ca/en/Discover/Commercial-Imaging-Solutions/SPAD-Sensor-Long-Range-Night-Vision |access-date=2025-02-20 |website=Canon Canada}}</ref>
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