Pi Huishi, Li Weiping, Shi Zhiwei, Chen Haining, Jiang Xiaoyu
School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
Department of Information Communication, Army Academy of Armored Forces, Beijing 100072, China.
Polymers (Basel). 2021 May 27;13(11):1754. doi: 10.3390/polym13111754.
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, and the photosensitive sensitivity is 7.91 × 10 cm/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.
N-乙烯基吡咯烷酮（NVP）具有较大的分子结构，因此在全息记录过程中难以扩散，尤其是在低空间频率下。我们使用甘油来促进NVP的扩散，并成功提高了光聚合物在低空间频率下的全息性能。随着甘油浓度的增加，全息性能先增加然后保持稳定。甘油的最佳浓度为0.21 mol/L。在此浓度下，光聚合物的最大衍射效率为84%，折射率调制为1.95×10，光敏灵敏度为7.91×10 cm/mJ。与对照组相比，在低空间频率（800 lp/mm）下的最大衍射效率、最大折射率调制和感光度分别提高了11.19倍、4.69倍和1.71倍。使用优化后的光聚合物进行透射全息记录和再现，我们获得了清晰明亮的透射全息图。用甘油改性的光聚合物有望应用于全息术、衍射光学等领域。
