光致变色俘精酸酐用于可擦写全息图像存储的研究

对一种新型可擦重写有机光致变色材料——俘精酸酐／聚甲基丙烯酸甲脂(PMMA)薄膜的光致变色双稳态吸收光谱进行了测量，呈色态的吸收峰在513nm，无色态的吸收峰在370nm。利用该双稳态特性，在10μm俘精酸酐／PMMA薄膜上进行全息图像光存储。实验用氩离子激光器514．5nm波长作为记录光源，测量了衍射效率与曝光量的关系，最大衍射效率约为1％．最佳曝光量约1J／cm^2。获得了存储于样品上的全息干涉条纹和参考光再现的衍射像，分析了影响衍射图像像质的因素。记录在样品上的全息图在室温下黑暗处可以保存一年以上，用紫外光可以擦除记录的全息图．进行多次记录、读出和擦除操作。结果表明，俘精酸酐可以作为一种性能优良的可擦写全息光存储材料。

Study of Holographic Image Storage in Rewritable Photochromic Fulgide Material

A new type of organic photochromic material―fulgide/PMMA film was investigated as a rewritable holographic recording medium. The bistable absorption spectra of the fulgide/PMMA film were measured. The maximum absorption of the colored state was centered at 513 nm, the peak absorption of the bleached state was at 370 nm. Based on the bistable states of the photochromic fulgide, holographic images were stored on the 10 μm film. Argon laser (514.5 nm) was used as recording light. The relation between the diffraction efficiency and the exposure was measured, which showed that the maximal diffraction efficiency was about 1% under the exposure 1 J/cm2 or so. Holographic gratings recorded on the film and diffraction images recovered by the reference beam were obtained. Factors influencing the recovery image′s quality were analyzed. The holographic gratings recorded on the film can be kept for over one year in darkness at room temperature, which can be erased by UV light. The sample can be written, read and erased in many times. The experimental results show that the fulgide can be used as a good rewritable holographic storage material.