Abstract
N-vinylpyrrolidone (NVP) has a large molecular structure, so it is difficult to diffuse during holographic recording, especially at low spatial frequencies. We used glycerol to promote the diffusion of NVP, and successfully improved the holographic performance of the photopolymer at low spatial frequencies. As the concentration of glycerol increases, the holographic performance first increases and then remains stable. The optimal concentration of glycerol is 0.21 mol/L. At this concentration, the maximum diffraction efficiency of the photopolymer is 84%, the refractive index modulation is 1.95 × 10−3, and the photosensitive sensitivity is 7.91 × 10−4 cm2/mJ. Compared with the control group, the maximum diffraction efficiency, maximum refractive index modulation and photosensitivity at low spatial frequencies (800 lp/mm) have increased by 11.19 times, 4.69 times and 1.71 times, respectively. Using the optimized photopolymer for transmission holographic recording and reproduction, we have obtained a clear and bright transmission hologram. The photopolymer modified with glycerol is expected to be applied to the fields of holography, diffractive optics, and so on.
Highlights
A photopolymer for holography is a form of light-responsive material based on polymerization reaction, which has the advantages of high diffraction efficiency, high spatial resolution and a simple preparation process
The holographic performance of an NVP-photopolymer at low spatial frequency has become an objective obstacle to its application in transmission holography
Photopolymers are a type of light-responsive material based on polymerization reactions
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. A photopolymer for holography is a form of light-responsive material based on polymerization reaction, which has the advantages of high diffraction efficiency, high spatial resolution and a simple preparation process. It has broad application prospects in the fields of sensors [1,2,3,4], diffractive optical elements [5,6,7,8,9], holographic interferometry [10,11], displays [12,13] and holographic recording materials [14,15]. To obtain high-quality transmissive holograms, photopolymer materials are required to have excellent holographic performance at lower spatial frequencies. The holographic performance of an NVP-photopolymer at low spatial frequency has become an objective obstacle to its application in transmission holography. The experimental results can provide effective guidance for the improvement of photopolymer performance
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