Comparison of nonlinear characteristics of phase holograms processed by various combinations of developers and bleaching agents

Optical densities before bleaching and final Lin curves of planewave phase holograms recorded in Agfa-Gevaert 8E75HD emulsions were measured for vario us combinations of developers (AAC, Pyrogallol and Catechol) and bleaching agents (R-9 and EDTA). To characterize the processing, the square root of t he diffraction efficiency of the processed holograms was related to the amp litude of the optical density modulation obtained at the development step. Characteristics of similar forms were obtained for all the processings, wit h significant differences in the slope and extent of the curves, so that se nsitivity, linearity and dynamic range of the processes could be compared d irectly.