| The transfer function and impulse response of photorefractive media are derived in the undepleted pump limit with passive absorption. The bandwidth of the transfer function is comparable to an inverse photorefractive time constant. The impulse response is time delayed by the product of the coupling and the time constant, and its FWHM is comparable to the delay.;The time delay from photorefractive gain and a saturable photorefractive loss are used to delay 235 ms wide input pulses by 100 ms without change of shape.;The stability boundaries of the photorefractive flip-flop, a bistable optical element recently demonstrated in this lab, are analyzed in the framework of Lotka-Volterra competitive systems and an equivalent Lotka-Volterra system is identified.;Several processing functions offered by reflexive multifrequency beam coupling, in which an incident set of signals couples to a copy of itself, are presented. This spatially distributed coupling process increases the transverse spatial cross correlations between signals. Using the speckle beam coupling solution derived in this group, it is shown that plane wave correlations grow much faster than those of speckle fields due to their long correlation length.;Related techniques in conjunction with perturbation theory are used to derive a crosstalk estimate for photorefractive data storage using lensless binary phase encoding in the presence of noise.;Reflexive multifrequency coupling finds extensive use in the Photorefractive Signal Extractor which isolates an arbitrary component from a stream of spatially superposed signals. I derive the performance of the device and estimate its capacity and contrast performance.;In the weakly nonlinear regime, an approximate solution to the temporal photorefractive grating evolution in terms of damped elliptic functions is identified. |
