ROLE OF PUMP PHASE FLUCTUATIONS IN A 2-PHOTON PHASE-SENSITIVE AMPLIFIER

We consider a phase-sensitive amplifier that consists of a system of t hree-level atoms in a cascade configuration that is prepared in a cohe rent superposition of upper and lower states by a strong classical fie ld. we have studied the role of pump phase fluctuations associated wit h the finite linewidth on the quantum-statistical properties of the ra diation field. A study of the output field characteristics reveals tha t the presence of a very weak pump field gives rise to equal variances in both field quadratures which are independent of linewidth. On the other hand, the presence of a strong pump held alters the output held characteristics with the generation of squeezing which is later on des troyed due to the presence of phase fluctuations.