Hologrm Recording with Highly Sensitive Photopolymer Material

研究了方英染料（SQD）光谱敏化光聚合物在He-Ne激光照射下的照相和全息特性。光聚合物层由基质聚合物、多功能单体（季戊四醇三丙烯酸酯）或酸活化交联剂（六聚甲氧基甲基三聚氰胺）、2,4,6-三（三氯甲基）-s-stiazine（TCT）和SQD组成。TCT同时作为自由基发生器和酸发生器。当TCT单独用作光引发剂而不使用敏化剂时，其灵敏度仅出现在小于300nm的紫外波长。因此，很难将其用作可见光成像材料的光自由基或光酸发生器。该染料的最大吸收波长为633nm。将TCT与SQD相结合，光谱灵敏度范围向红光光谱区显著扩展。TCT通过电子转移机制从光激发的SQD到TCT同时生成自由基和酸。光聚合系统记录了衍射效率高达98%的李普曼全息图。利用化学放大抗蚀剂系统记录了高衍射效率（>30%）的浮雕全息图。得到了He-Ne激光全息记录的灵敏度为1 mJ/cm^2数量级。

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.