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The amplitude of the first-order diffracted wave is computed as a function of the thickness and the variation of dielectric constant of a dielectric grating, if the light is incident at the Bragg angle. It is shown that it is possible to diffract 100% of the incident radiation if the thickness and variation of dielectric constant are chosen suitably. The values given by the theory for this case seem to be within the experimental domain. For holography it seems undesirable to increase the thickness beyond the value needed for maximum diffraction because the dependence on the angle of incidence then changes in an undesirable way.
C Burckhardt (1967) studied this question.