Improvement of Pulsed Holographic Recording Characteristics of Polyvinyl Alcohol/acrylamide Green-sensitive Photopolymer

摘要

Coherent pre-illumination technique is proposed to improve the pulsed holographic recording characteristics of polyvinyl alcohol (PVA) /acrylamide green-sensitive photopolymer. By optimizing the pre-illumination parameters such as pre-illumination energy density and pre-illumination delay time, the photosensitivity and diffraction efficiency of photopolymer under pulsed holographic recording are improved effectively. For the coherent pre-illumination energy density of 2mJ/cm~2, total pre-illumination energy of 50mJ/cm~2, the diffraction efficiency of 85% can be obtained with holographic exposure of 35mJ/cm~2 . For the coherent pre-illumination delay time of 20seconds, the diffraction efficiency of 60% is obtained with holographic exposure of 17.5mJ/cm~2. The photosensitivity is successfully improved about 8 times compared with other reported results, it has good application prospects in the measurements of high-speed transient processes.