Real time parallel optical logic in photorefractive BSO

Abstract

Fast parallel analog and digital optical computing operations are demonstrated by using an interferometric arrangement with photorefractive bismuth silicon oxide. Image subtraction, coherent weighted-image addition, exclusive OR/NOT, and OR optical gates are achieved by controlling the relative phase shifts of two phase-conjugate waves generated by degenerate four-wave mixing.

Optics Letters (1988) Vol.13 pp.503-505

doi: 10.1364/OL.13.000503