Photon statistics of random lasers with resonant feedback

We have measured the photon statistics of random Lasers with resonant feedb ack. With an increase of the pump intensity, the photon number distribution in a single mode changes continuously from Bose-Einstein distribution at t he threshold to Poisson distribution well above the threshold. The second-o rder correlation coefficient drops gradually from 2 to 1. By comparing the photon statistics of a random laser with resonant feedback and that of a ra ndom laser with nonresonant feedback, we illustrate very different lasing m echanisms for the two types of random lasers.