The theory of diffraction by gratings formed by the interference of two crossed three-dimensional “arbitrary-profile plane waves” in a photosensitive medium is developed. The detailed diffraction characteristics for the case of crossed-beam gratings formed by two three-dimensional “Gaussian plane waves” are presented. The diffraction efficiencies of these gratings and the profiles of the transmitted and diffracted beams are calculated as functions of the grating strength. The influence of the relative size (the Gaussian beam diameter) of the two writing beams on the diffraction efficiency is determined. Diffraction characteristics for readout with beams of profiles different from those used for writing are presented.
© 1980 Optical Society of AmericaPDF Article