Photopolymer for recording transmission and reflection volume phase holograms

摘要

Recently, a number of photopolymers for recording volume phase hologram have been proposed. We have developed the novel photopolymerizable materials for recording the transmission and reflection volume holograms. These hologram recording materials are composed of lower-refractive index binding polymers, higher-refractive index monomers, plasticizers, photoinitiators, and photosensitive dyes. In this paper, the experimental results for the holograms using these materials would be presented. These materials can record both transmission and reflection volume holograms with high sensitivity, high diffraction efficiency, high resolution, and high heat resistance. These holograms were self-developing and white light was sufficient for fixing. After recording holograms, no treating to fix such as heat processing or postexposure of UV were needed. The optical and thermal properties of obtained hologram are written as follow. The diffraction efficiencies were over 90 %. Transmittance was about 90 %. Sensitivities were less than 10 mJ/cm~2 from UV light to Ar ion laser. And, these holograms have the heat resistance over 100℃. The mechanisms of refractive index modulation in photpolymerization of the materials are also discussed.