Abstract
A novel photopolymer for the fabrication of high-resolution volume-phase holograms, which primarily are used for holographic optical elements, is reported. This photopolymer consists of a thermosetting resin as a polymeric binder, a polyfunctional monomer, a photoinitiator, and a sensitizing dye. The chemistry to form images is based on the polymerization of an acrylic monomer initiated by radical species while making the holographic exposure, and accelerated diffusion transfer of the polymerized monomer with postexposure baking, and of a bisphenol-type epoxy resin as a binder initiated by cations with UV exposure, which are generated through photodecomposition of a diaryliodonium salt-sensitized 3-ketocoumarin dye. Exposure of these photopolymer films to an Ar+ laser beam emitting 514.5 nm light at 60–150 mJ/cm2 and subsequent heat treatment resulted in a refractive index alteration according to the light intensity. With this dry process, high diffraction efficiency and heat-stable holograms can be formed. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2189–2200, 2000
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