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4 May 2012Analysis of PEA photopolymers at zero spatial frequency limit
The PEA photopolymer is composed of dipentaerythritol penta/hexa-acrylate as monomer and binder, N-vinyl
pirrolidone as crosslinker, ethyl eosin as dye and N-methyl diethanolamine as radical generator. This photopolymer is
suitable to work with dispersed liquid crystal molecules in dynamic holographic and diffractive applications. In order to
characterize these materials we have analyzed the behaviour of different compositions at zero spatial frequency limit.
This method is based on an interferometer that has been successfully applied in the phase-shift versus applied voltage
characterization of liquid-crystal displays, in addition to that it has been applied to characterize PVA/AA and
PVA/NaAO photopolymers. In PEA case there is no shrinkage since the photopolymer is coverplated. Samples have a
glass substrate as the cover plate. In our analysis we have studied the importance of the monomer, crosslinker and crystal
liquid molecules concentrations, in the phase shift produced in the layer during photopolymerization process.
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Sergi Gallego, Andrés Márquez, Marina Riquelme, Cristian Neipp, Manuel Ortuño, Augusto Beléndez, Inmaculada Pascual, "Analysis of PEA photopolymers at zero spatial frequency limit," Proc. SPIE 8429, Optical Modelling and Design II, 842925 (4 May 2012); https://doi.org/10.1117/12.921789