A relatively simple model for elucidating the holographic storage mechanism in bleached silver halide recording materials is developed. In this model the storage of holographic gratings includes three separate contributions that are due to silver halide grains, a gelatin matrix, and voids in the gelatin matrix. Linear refractive-index-modulation-versus-exposure responses are assumed for the individual contributions, which are summed to produce the overall diffraction-efficiency (DE)-versus-exposure response. Calculated and experimental results reveal that, through reduction of one or more of the contributions to the holographic storage in a composite emulsion system through chemical means, the maximum achievable DE's increase and may reach 100% in the case of a homogeneous and lossless phase grating. Specifically, the addition of sulfite or triethanolamine to the processing formulations in a reversal bleach processing procedure or in a silver halide sensitized gelatin procedure had the effect of increasing the experimental DE's. The corresponding calculated DE-versus-exposure responses indicate that these additives suppressed the gelatin tanning or matrix void contributions.
© 1994 Optical Society of America
Victor Weiss and A. A. Friesem, "Storage mechanism of volume phase holograms recorded in silver halide emulsions," J. Opt. Soc. Am. A 11, 2004-2010 (1994)