New photopolymer with trifunctional monomer for holographic applications

Abstract

New holographic recording materials based on photopolymerizable systems have contributed significantly to the recent growth of holographic applications. Previously, we reported that in photopolymerizable systems with a difunctional monomer, Ethylene Glycol DiMethAcrylate (EGDMA) improves the behaviour of the system and explains the role played by an eosin ester that has an oxo-oxime group in the production of amine initiator radicals. This comparative study was carried out in our laboratory using differential scanning photo-calorimetry and holography. The results of the new photosensitive recording materials for holography indicate that this system can be used for the formulation of very promising photopolymers that have a better performance. The aim of this study was to change the crosslinking monomer in order to increase the energetic sensitivity and discover the rest of the behavior. The new photo-polymerizable mixture contains PentaErythritol TriAcrylate (PETA) in a 1:1 ratio of volume and a 2-Hydroxy-Ethylene MethAcrylate monomer (HEMA). A diffraction efficiency of 80% is achieved with an energetic sensitivity of 3 J/cm2 at 514 nm, and the spatial resolution is up to 2000 lines/mm.