An aqueous photopolymer for classroom holography

摘要

An aqueous photopolymer possessing good photosensitivity for recording holo grams in red laser light is described. This development follows the author's earlier discovery of the enhancing effects of an acid-base amine combination used as a free-radical producing co initiator with methylene blue dye to polymerise suitable monomers. The system also works with green laser light using the dye safranine-O. After exposure, the image develops in water. With this photopolymer, individual students in a classroom can use small cheap red laser pointers with their collimating lenses cut off to make simple Denisyuk holograms under subdued lighting. As the polymer is water-based, its preparation in a school lab is feasible.