In this article the behavior of thick photopolymer layers as material for holographic recording is studied. The material used is a photopolymer based on acrylamides, consisting of acrylamide as monomer, yellowish eosin as sensitizer and triethanolamine as radical generator, all on a matrix of polyvinyl alcohol. We studied the influence of the thickness of the layer on the behavior of the photopolymer as a holographic recording material. According to Kogelnik's theory, the thickness determines the temporal or energetic evolution of the diffraction efficiency.
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