  We present a feasible protocol using traveling wave field to experimentally
observe negative response, i.e., to obtain a decrease in the output field
intensity when the input field intensity is increased. Our protocol uses one
beam splitter and two mirrors to direct the traveling wave field into a lossy
cavity in which there is a three-level atom in a lambda configuration. In our
scheme, the input field impinges on a beam splitter and, while the transmitted
part is used to drive the cavity mode, the reflected part is used as the
control field to obtain negative response of the output field. We show that the
greater cooperativity of the atom-cavity system, the more pronounced the
negative response. The system we are proposing can be used to protect devices
sensitive to intense fields, since the intensity of the output field, which
should be directed to the device to be protected, is diminished when the
intensity of the input field increases.
