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Two-model spectral study of volume holograms in materials with diffusion-based mechanisms

机译：具有扩散机制的材料中体积全息图的两模型光谱研究

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We devote this article to the spectral analysis of volume holograms recorded in materials with diffusion-based formation mechanisms. Two media of different natures were examined: polymer material with dye molecules photoattachable to macromolecules (PQ-PMMA) and photochromic additively colored fluorite crystal (CaF_2). Differential spectra of holograms refractive index and absorbance were determined by two approaches: numerical approximation of both spectral and angular hologram response (selectivity hypercontour) by coupled-wave theory and processing hologram spectra by Kramers-Kronig dispersion relations. The principles of the two approaches, results of their application, and advantages and disadvantages are discussed. Kramers-Kronig relations can be usefully applied in cases where the nature of holograms formation is well studied, whereas the hypercontour approach is indispensable for obtaining the values of absorbance and refractive index modulation; therefore, a combination of both the techniques is a powerful tool for fundamental investigation of the hologram formation mechanisms.
机译：我们致力于这篇文章对基于扩散形成机制的材料中记录的体积全息图进行光谱分析。研究了两种不同性质的介质：具有可与大分子光连接的染料分子的聚合物材料（PQ-PMMA）和具有光致变色的彩色萤石晶体（CaF_2）。通过两种方法确定全息图折射率和吸收率的差分光谱：通过耦合波理论对光谱和角全息图响应（选择性超轮廓）进行数值逼近，并通过Kramers-Kronig色散关系处理全息图光谱。讨论了这两种方法的原理，其应用结果以及优缺点。在充分研究全息图形成的性质的情况下，Kramers-Kronig关系可以有用地应用，而超轮廓方法对于获得吸光度和折射率调制值是必不可少的。因此，这两种技术的结合是对全息图形成机理进行基础研究的有力工具。

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