The aim of this thesis is to study the quantum properties of light produced by arnnon-degenerate three-level atom driven by strong coherent light in a cavity con-rntaining a parametric ampli er and coupled to a two-mode vacuum reservoir. Byrnusing the master equation of the system, the stochastic di erential equations ofrnthe expectation value of the operators are obtained. Further manipulating of thernquantum Langevin equations, the decoupled stochastic di erential equations be-rntween cavity mode and atomic operators are established. On the other hand therncorrelation properties of the noise operators are obtained by using the quantumrnLangevin equations. For cavity mode operators, the steady state solutions of therndecoupled di erential equations are used to calculate the photon statistics of sin-rngle mode as well as the two mode cavity light beams. The quadrature variancesrnof the single modes as well as the two-mode are also obtained from the steadyrnstate solutions of the operators. The single modes are in chaotic state, where asrnthe two-mode can be in squeezed state for some combinations of the consideredrnparameters. The quadrature squeezing occurs in both minus quadrature and plusrnquadrature for di erent values of rn, and . The maximum squeezing occurs in thernplus quadrature with a quadrature squeezing of 60%. Moreover, the entanglementrnof the cavity radiation is analyzed using di erent criteria. It is found that thernpresence of parametric ampli er and coherent light enhance entanglement of therncavity light. The Duan et. al. and logarthmic negativity entanglement criteriarnindicate that the quantum optical system generates entangled photons.