A number of signal-processing devices have been developed that use the Bragg interaction between laser beams and surface acoustic waves in transparent delay lines. Convolvers and correlators having time-bandwidth products of up to 10,000 have been constructed and have been used to obtain signal-to-noise enhancement of signals buried in noise. A real-time, continuous Fourier transformer has been achieved. Initial results have been obtained in performing a discrete Fourier transform using an acoustooptic implementation of the triple-product convolver. A programmable memory correlator based on the acousto-photorefractive effect has been demonstrated using two distinct writing modes and writing-laser wavelengths.