提高记录单体在成膜物中的迁移速率,加大记录单体与成膜物的折射率差,可以实现光致聚合物的折射率空间调制最大化.本工作以高折射率的超支化聚酯(折射率1.586)为成膜树脂,利用超支化聚合物分子结构疏松、便于小分子在其间扩散的特性,同时以低折射率的单官能团含氟丙烯酸酯(折射率1.372)和高活性的双官能团丙烯酸酯(折射率1.457)为记录单体制备了光致聚合物全息膜,以衍射效率为指标优化单体构成和全息膜的厚度,研究了该全息膜的衍射效率、空间分辨率、折射率调制度等性能.该光致聚合物全息材料的折射率调制度为4.82×10-3,衍射效率达到99.4%,在空间分辨率3750 lp/mm的衍射效率仍然达到85.6%,感光灵敏度56 mJ/cm2.
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