Multiple image storage using a crossed grating

Abstract

We describe a method of storing a number of real amplitude images on a photographic plate by modulating each image on a different spatial carrier. The signal to be stored is placed in contact with a grid (2 crossed gratings) and this ensemble is imaged on a photographic plate. By choosing a different pair of diffracted orders of the grid, each signal is coded on a different fringe system. The grid remains stationary throughout the operation of storage. Upto eight images have been stored. The signal to noise ratio is calculated and the results are given.