Triggering techniques in triggered photon-counting

In the measurement of triggered photon-counting distributions (TPCDs) the triggering pulse which starts a collecting interval may be picked up according to different random procedures. We investigate, both theoretically and experimentally, the extent to which TPCDs are affected by the choice of the triggering pulses. It turns out that in ordinary conditions the measured distribution may be significantly influenced by the triggering procedure. This result is another manifestation of the bunching effect and indicates that a great deal of attention should be exercised in performing and interpreting triggered photon-counting.