Investigation of dissipative Ponderomotive effects of electromagnetic radiation

An experiment is described in which a variation in the decrement of mechanical oscillations of a mobile wall of an ultrahigh frequency resonator was observed in the presence within the resonator of a powerful electromagnetic field (the effect of electromagnetic damping). The coefficient of electromagnetic damping introduced into the mechanical oscillator changes both in magnitude and in sign depending on the tuning of the resonator. The measured numerical values of the damping coefficient agree satisfactorily with a theoretical estimate.