The second-order intensity correlation function of light transmitted out of
a cavity QED system exhibits the nonclassical features and dynamics of the
atom-field interaction. We present measurements of the intensity correlati
on to examine the size of the nonclassical features and the dependence on d
riving intensity, detuning, and the strength of the atom-field coupling. We
use a model that takes into account experimental conditions to achieve a q
uantitative agreement with the observations.