  In this paper, the dynamics of fluorescent light emitted by a two-level atom
interacts with squeezed vacuum reservoir is studied wisely using two-time
correlation function fundamentals. The mathematical analysis shows the
fluorescent spectrum of light emitted by the atom is turned out to be a single
peak at a Lorentz's frequency. On the other hand, the squeezed vacuum reservoir
input is responsible to the stimulated emission of photon from the atom.
Moreover, it is identified that thermal reservoir is more efficient than
squeezed vacuum reservoir to have valuable power spectrum.
