TRANSFER OF TEMPORAL FLUCTUATIONS IN PHOTOREFRACTIVE 2-BEAM COUPLING

Transfer of temporal fluctuations between the signal and pump beams in diffusion dominated photorefractive two-beam coupling is studied expe rimentally. The dependence on the gain, beam intensity ratio, and freq uency of the fluctuations is found to agree well with a linearized ana lysis, The transfer of perturbations is frequency dependent at low fre quencies, and becomes constant at frequencies large compared to the in verse material time constant. Vde discuss the possibility of pump nois e suppression when amplifying weak signals. (C) 1997 American Institut e of Physics.