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We have investigated the spreading of the avalanche process over the area of reach-through avalanche photodiodes operated in Geiger mode. A comparison between the measurements and the results of a computer simulation suggests that photons emitted from hot carrier relaxations play the dominant role in the avalanche dynamics. It is the randomness of the photon-assisted process which impairs the performance of these detectors in timing measurements.
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Lacaita et al. (1993) studied this question.
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