title: Surface wave delay line acoustooptic devices for signal processing.
abstract: Several acoustooptic devices have been developed for use as electronic signal processors at the Harry Diamond Laboratories. These devices use the Bragg interaction between a coherent light beam and surface acoustic waves propagating in a transparent crystalline delay line. Both real-time convolution and correlation of signals have been performed, and a real-time continuous Fourier transform has also been achieved. A programmable memory correlator has been demonstrated. This device uses a newly discovered photorefractive effect to store an image of a surface acoustic wave in a lithium niobate delay line. An acoustooptic implementation of the triple-product convolver is under active development. This device has been proposed for use in conjunction with charge-coupled-device chirp-Z-transform modules to perform very long discrete Fourier transforms and to do omega-k beam forming.
authors.forename: N J
authors.initials: NJ
authors.lastname: Berg
authors.forename: J N
authors.initials: JN
authors.lastname: Lee
authors.forename: M W
authors.initials: MW
authors.lastname: Casseday
authors.forename: B J
authors.initials: BJ
authors.lastname: Udelson