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A Review of selected technological applications of DCG holograms

机译：DCG全息图的选定技术应用述评

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The subject matter of this presentation is to demonstrate the engineering applications of holographic optical elements (HOEs) fabricated in dichromated gelatin (DCG) films exhibiting enhanced properties. The composition, structure and the physical, chemical and optical properties of the DCG-film are briefly described in the introduction that is followed by detailed discussion of the developing processes used to achieve the necessary holographic characteristics required by the various applications. Other procedures are used to achieve explicit objectives, e.g., controlling the spectral characteristics of the HOE by inorganic and/or organic additives and using filler material to enhance the UV or IR performance. Stress induced by environmental forces, e.g., wind, or by mechanical strain also changes the performance of the HOE and may be exploited in engineering applications. The optical characteristics of the HOE are also modified by internally induced stress, such as changing the water content of the polymer or using cross-linking agents to modify and harden the gelatin matrix. The formation of thermal or density gradients in the gelatin film during the coating process or at some stage of the hologram development have also an effect on the holographic properties for they determine the conformational state and the mechanical strength of the gelatin film. The ratio between the coiled and the helical structures in the gelatin matrix determines the optical and mechanical properties of the holographic film. Multiple exposures are used to record up to four holograms in single DCG film that are used to reconstruct concurrently several monochrome or RGB beams.
机译：此演示文稿的主题是演示全息光学元件（HOE）在具有增强性能的重铬酸盐明胶（DCG）薄膜中制造的工程应用。引言中简要介绍了DCG膜的组成，结构以及物理，化学和光学性质，随后详细讨论了用于实现各种应用所需的必要全息特性的显影工艺。其他程序可用于实现明确的目标，例如，通过无机和/或有机添加剂控制HOE的光谱特性，并使用填充材料来增强UV或IR性能。由环境力（例如风）或机械应变引起的应力也会改变HOE的性能，可在工程应用中加以利用。 HOE的光学特性还可以通过内部感应的应力来改变，例如改变聚合物的水含量或使用交联剂来改变和硬化明胶基质。在涂覆过程中或在全息图显影的某个阶段，在明胶膜中形成热梯度或密度梯度也对全息性能产生影响，因为它们决定了明胶膜的构象状态和机械强度。明胶基质中的螺旋结构和螺旋结构之间的比例决定了全息膜的光学和机械性能。多次曝光用于在单个DCG胶片中最多记录四个全息图，用于同时重建几个单色或RGB光束。

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