Study on the causes of bubbles in PQ / PMMA optical holographic storage materials

This paper focuses on the causes of bubbles in the fabrication of holographic storage materials phenan- threnequinone(PQ)/polymethyl methacrylate(PMMA).Three main possibilities for generating bubbles are proposed.Azodiisobutyronitrile(AIBN) decomposes to generate nitrogen,which cannot diffuse to generate bubbles.The temperature is too high,and the local boiling of methyl methacrylate(MMA) produces bub- bles.Bubbles caused by changes in material volume.Simulation and experimental verification of the three cases show that the main reason for the generation of bubbles is the sudden shrinkage of the material.It is determined that the temperature is the second in uencing factor.