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A highly sensitive optical sampling system at 1.5 µm is described, in which an Si avalanche photodiode is used as a two photon absorber for the cross-correlation measurement of optical pulse shapes. The sampling pulse is generated from a passively and actively modelocked external-cavity semiconductor laser with a repetition rate of 10 GHz, and 2 ps temporal resolution is achieved.
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K. Kikuchi (1998) studied this question.
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