Three-dimensional photochemical machining with lasers

Research on the development of new photoinitiator systems for spatially selective photochemical machining with lasers has continued smoothly and is progressing well. The porphyrin systems developed during the second quarter continue to look particularly promising. Further experiments on the 2-component photoinitiator systems comprised of 9,10-dibromoanthracene and naphthalene sulfonyl chloride have confirmed that photopolymerization can be selectively enhanced by 2-beam irradiation. This is the first report of a 2-photon, 2-component polymerization system, to our knowledge.