  In this paper, we study the nonlinear kerr effect in an inverted Y-type
five-level atom moving through an open cavity. Under realistic parameters, we
show that the kerr-medium affects the atomic population inversion and the phase
probability distribution. A remarkable feature of the present model is that the
kerr nonlinearity with a multi-level atom allows for a large detection of the
system dynamics. These results offer new possibilities for controlling the
system dynamics using the time-dependent interaction.
