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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 5 13nm ,无色态的吸收峰在 370nm。利用该双稳态特性 ,在 10 μm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 5 14 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/cm2 。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
Photochromic bistable absorption spectra of a new type of erasable organic photochromic material, fulgide / polymethylmethacrylate (PMMA), were measured. 5 13nm, colorless state absorption peak at 370nm. Using this bistable characteristic, holographic image light storage was performed on a 10 μm fulgide / PMMA film. The experimental results show that the maximum diffraction efficiency is about 1% and the optimum exposure is about 1 J / cm2 when the wavelength of 5 14 5 nm is used as the recording light source. The holographic interference fringes stored on the sample and the diffracted images reproduced by the reference light were obtained, and the factors affecting the image quality of the diffracted images were analyzed. The hologram recorded on the sample can be stored in the dark for more than a year at room temperature. The recorded hologram can be erased with ultraviolet light for multiple recording, readout and erasing operations. The results show that fulgide can be used as an excellent erasable holographic optical storage material