Applyillg the solutions of the qualltulIl Langevin equations, we calculate thernvariances of the quadrature operators for the cavity mode, the squeezing spectrulI/,rnspectrulll of intensity fluctuatiolls alld the power spectrum of the output modernproduced by two-level atoll/s interacting with a single cavity mode, driven by arncoherent light and coupled to a squeezed vacuum reservoir. Employing the samernsolutions, we obtain the antillorll/ally ordered characteristic jilllctioll defined ill thernHeisellberg picture. With the aid of the resultillg characteristic jill/ctioll, werndetermille the Q jill/ctioll which is thell used to calculate the lIleall alld variallce ofrnthe photollllulllber as well as the photolllllllllber distributioll of the output mode