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Avalanche photodiode (APD) finds its application in laser range finders, optical tomography, fiber optic communication systems, LIDAR, fluorescence detection, particle sizing and other photon counting situations. It has the advantage of high sensitivity and high response time. APDs are generally recommended for high bandwidth applications or where internal gain is needed to overcome high preamplifier noise. APDs are commercially available that span the wavelength range from 300nm to 1700nm. Silicon APDs can be used at wavelengths of 300nm-1100nm, Germanium: 800nm-1600nm, and InGaAs: 900nm-1700nm. Quantum efficiency, total leakage current and noise are important factors in choosing the right APD for your application.