Abstract
1.5 µm two-photon absorption in a single photon counting silicon avalanche photodiode at record continuous-wave levels below 100 µW is reported. Autocorrelation of a 10 GHz, 1.67 picosecond pulsetrain using this device demonstrates 1.5×10−3 (mW)2 peak-power times average-power sensitivity without the use of lock-in detection.
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