基于数字全息法测量光致聚合物的收缩

Measurement of shrinkage of photopolymer based on digital holography

数字全息具有测量精度高、实时性强等优势,在诸多领域有极高的应用价值;光致聚合物作为光存储介质,是最有前途的全息记录材料之一,但记录过程中发生光聚合反应而引起的厚度收缩极大影响了记录效果,为测量其厚度的具体收缩量,提出一种基于数字全息的光致聚合物收缩率测量方法。以马赫曾德干涉光路为基础设计实验系统,记录光致聚合物反应前后的全息图,利用全息干涉计量的方法计算相位改变量,根据相位差与收缩的关系计算得到光致聚合物的收缩率。

Digital holography has the advantages of high measurement accuracy and real time,and has high application value in many fields;photopolymer,as an optical storage medium,is one of the most promising holographic recording materials,but the thickness shrinkage caused by the photopolymerization reaction during the recording process greatly affects the recording effect,and in order to measure the specific shrinkage of its thickness,a digital holography-based measurement method for the shrinkage of photopolymer is proposed.The experimental system is designed based on the Mach-Zender interferometric optical path,and the holograms of the photopolymer before and after the reaction are recorded,and the phase change is calculated by using the holographic interferometry method.