Ultra-sensitive autocorrelation of 1.5 mu m light with single photon counting silicon avalanche photodiode
17 January 2002
1.5 mum two-photon absorption in a single photon counting silicon avalanche photodiode at record continuous-wave levels below 100 muW is reported. Autocorrelation of a 10 GHz. 1.67 picosecond pulsetrain using this device demonstrates 1.5 x 10 (3) (mW)(2) peak-power times average-power sensitivity without the use of lock-in dectection.