  We analyze the behavior of electromagnetic fields inside a resonant cavity by
solving Einstein--Maxwell field equations. It is shown that the modified
geometry of space-time inside the cavity due to a propagating mode can affect
the propagation of a laser beam. It is seen that components of laser light with
a shifted frequency appear originating from the coupling between the laser
field and the mode cavity due to gravity. The analysis is extended to the case
of an asymmetric resonant cavity taken to be a truncated cone. It is shown that
a proper choice of the geometrical parameters of the cavity and dielectric can
make the gravitational effects significant for an interferometric setup. This
could make possible to realize table-top experiments involving gravitational
effects.
