GENERATION OF QUANTUM PHOTON STATES BY AN ACTIVE MICROCAVITY TRAP

Nonclassical radiation has been generated in an active Fabry-Perot dye microcavity excited by a femtosecond laser. Generation of single-phot on states over the forward cavity mode, with a nonclassical sub-Poisso nian distribution has been demonstrated in these conditions. By multip le excitation of the active medium collective emission phenomena are e xpected because of the superradiant coupling occurring within the tran sverse area of coherence of the microcavity. In particular, we have ex perimentally verified, with femtosecond temporal resolution, the princ iple of relativistic causality within the process of two-dipole superr adiance by transverse interaction in conditions of strong microcavity confinement.