QUANTUM-NOISE REDUCTION IN STATIONARY SUPERRADIANCE

We discuss a laser with N three-level atoms resonantly and cooperative ly interacting with two cavity modes. Its intensity is proportional to N-2, the linewidth scales as 1/N-2, and the output intensity fluctuat ions display up to 100% squeezing at low frequencies. We show that qua ntum fluctuations of the pump do not deteriorate the squeezing signifi cantly. We also find that the fluctuation properties of the ''passive' ' cavity mode which serves to collectively relax the atoms to the grou nd state are similar to those of the active mode. Finally we take into account spontaneous emission. Within a certain range of frequencies g ood squeezing can still be found.