Abstract

A new method of formation of relief-phase holographic structure on dichromated gelatin (DCG) layers has been proposed. The method is based on two types of alternative effects on gelatin: structuring by selective light tanning by coherent He–Cd laser radiation and destruction by short-wave UV radiation. A time-shortened water treatment of samples interrupted by an isopropanol bath was previously proposed to obtain highly effective holographic relief structures in the region of high spatial frequencies up to 1500 mm^–1. In this paper, it has been proposed to abandon the water treatment of dichromated gelatin layers and replace it by heating the sample during its processing with short-wave UV radiation. In the course of experiments, a steady increase in the diffraction efficiency has been obtained regardless of the spatial frequency and dichromated gelatin layer thickness, which has been explained by the formation of a relief holographic structure because of the evaporation and shrinkage of gelatin areas degraded by UV radiation under the influence of high temperature.

中文翻译：

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热处理在二色明胶浮雕相全息结构形成中的应用

摘要

提出了一种在重铬酸盐明胶层上形成浮雕相全息结构的新方法。该方法基于对明胶的两种替代作用：通过相干He-Cd激光辐射进行选择性光鞣制和通过短波UV辐射破坏而形成明胶。先前曾建议对被异丙醇浴打断的样品进行时间缩短的水处理，以在高达1500 mm ^–1的高空间频率区域获得高效的全息浮雕结构。。在本文中，已经提出放弃重铬酸盐明胶层的水处理，并通过在短波紫外线辐射处理过程中加热样品来代替它。在实验过程中，不管空间频率和重铬酸盐明胶层的厚度如何，衍射效率都得到了稳定的提高，这可以通过形成浮雕全息结构来解释，因为明胶区域的蒸发和收缩会降低紫外线辐射受高温影响。