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Avalanche Photodiodes

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Avalanche Photodiodes

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We can no longer imagine low-light detection, laser radar systems, optical data transmission, bar-code scanners or bio-medical equipment without avalanche photodiodes (APDs). APDs differ from "normal" PIN photodiodes in that incoming photons internally trigger a charge avalanche. The prerequisite for this is the application of reverse bias voltage to the APD to broaden the absorption layer "A".

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