PHOTON NUMBER SQUEEZING ENHANCED BY 2-PHOTON PROCESS IN EXCITONIC SYSTEMS

We demonstrate quenching of pump noise by two-photon resonant absorpti on in a cavity under competition with the one-photon process. This que nching leads to strong squeezing of photon number fluctuation, thus co nverting a largely super-Poissonian field into a sub-Poissonian one. A strong candidate as an appropriate medium in the microcavity is Anthr acene-PMDA or CuCl. These crystals exhibit giant two-photon absorption due to the formation of excitonic 2-strings or biexcitons. We also pr esent results for the spectral content of the cavity field which confi rm the complementary nature of the amplitude and phase fluctuations.