“…PQ (9,10-phenanthrenequinone)-doped PMMA (polymethyl methacrylate), PQ/PMMA, was first reported by Steckman et al in 1998 as the easy-to-make holographic recording material with low shrinkage and low cost. − In 2000, Lin et al developed the method of two-step thermal polymerization and fabricated the bulk material of PQ/PMMA with large dimensions . In 2008, Luo et.…”