Hologrm Recording with Highly Sensitive Photopolymer Material

点击翻译按钮获取中文摘要

The photographic and holographic characteristics of photopolymer spectrally sensitized with squarilium dye(SQD) were investigated under He-Ne laser exposure. The photopolymer layr consists of four components : matrix polymer, multifunctional monomer (pentaerythritol triacrylate) or acid-activatable crosslinker (hexamethoxymethyl melamine), 2,4,6-tris(trichloromethyl)-s-stiazine(TCT) and SQD.TCT acts as a radical generator and an acid generator at the same time. When TCT was used as the photoinitiator by itself without sensitizer, the sensitivity appeared only ultraviolet wavelength shorter than 300nm. Therefore it is difficult to use it as a photo-radical or photo-acid generator of visible light imaging material. The dye has a wavelength of absorption maximum at 633nm. By combining TCT with SQD, the range of spectral sensitivity was remarkably extended toward red-light spectral region. TCT gave a radical and an acid simultaneously by electron transfer mechanism from photoexcited SQD to TCT.Lippmann hologram with a high diffraction efficiency(98%) was recorded by the photopolymerization system. Relief hologram with high diffraction efficiency(>30%) was recorded by the chemically amplified resist system. The sensitivity of hologram recording of the order of 1 mJ/cm^2 was obtained for He-Ne laser light.