  We consider a nonclassical state generated by an atom-cavity field
interaction in presence of a driven field. In the scheme, the two-level atom is
moved through the cavity and driven by a classical field. The atom interacts
dispersively with the cavity field, which results in a photon-number-dependent
Stark shift. Assuming that the atom enters the cavity in the excited state
$|{a}\rangle$, the obtained output cavity field is taken into account. The
state vector $|\psi(t)\rangle$ describes the entire atom-field system but in
our work we deal with the statistical aspects of the cavity field only. The
quantum state that corresponds to the output cavity field is obtained by
tracing out the atom part from $|{\psi(t)}\rangle\langle{\psi(t)}|$. Different
quantum phase properties such as quantum phase distribution, angular $Q$ phase
function, phase dispersion are evaluated for the obtained radiation field. The
second-order correlation function $g^2(0)$, an indirect phase characteristic is
also considered.
