Controllable real-time simple spatial filter based on selectively erasing in photorefractive two-beam coupling

Based on selectively erasing part of phase gratings of an image Fourier spectrum by an extra beam in photorefractive two-beam coupling in a SBN:Ce crystal, a new dynamic simple spatial filter is proposed, which has the advantages of both controllable operation and simple experimental arrangement. Computational simulation and experimental demonstration are made with an example of high pass filtering.