Thin-Layer Holographic Photopolymer Materials with High Refractive Index Modulation

Modified holographic photopolymer materials, which were developed in the Vorozhtsov Novosibirsk Institute of Organic Chemistry and provide high diffraction efficiency (DE) at a small recording layer thickness as a result of posttreatment, were studied by recording the reflection and transmission volume elementary holograms. Some samples of volume reflection holograms with DE of 90% were obtained at a recording layer thickness of nearly 10 mu m and the refractive index modulation Delta n of no less than 0.036. The obtained holograms had high transparency throughout the entire visible spectral region, small shrinkage, and good uniformity in the spatial grating structure as evidenced by the sharp graphic of side lobes in the spectral response contour.