Fabrication of an efficient green sensitive photopolymer for holographic applications

An efficient green sensitive photopolymer material for holographic applications is indigenously prepared using polyvinyl alcohol binder, acrylamide monomer, triethanolamine photo-initiator and erythrosine B photo-sensitizer under normal laboratory conditions. The influence of monomer cross-linker on the performance of photopolymer material is investigated by incorporating N-N'- methylene-bis-acrylamide as monomer cross-linker in the photopolymer composition. Suitability of photopolymer material for holographic applications is investigated by finding the diffraction efficiency of first order holographic volume transmission gratings recorded in the fabricated photopolymer. Average thickness of the photopolymer film and several recording parameters such as inter-beam angle, inter-beam ratio and laser exposure energy are optimized to enhance the diffraction efficiency of gratings. The fabricated photopolymer is found suitable for holographic applications as the material is capable to record holograms with good diffraction efficiency of 70 %.