Nonlinear recording effects on holographic reflection gratings recorded on BB640 emulsions have been studied. Using an analyticalapproach to the characteristic curve of these emulsions, we obtained the recorded density profiles corresponding to the original light pattern generated by the holographic setup. The final spatial profiles of the refraction index resulting from different exposure levels and different bleaching processes were evaluated studying the experimental diffraction efficiency and comparing it with Kogelnik’s theory. The quality of the fittings of this model with the experimental spectral responses of the final gratings was used as a measure of concordance between the original sinusoidal, periodical light distribution and the resulting modulation profile of the processed hologram. The range of applicability of the theoretical model to the experimental results was evaluated using different bleaching processes.
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