The performance of a holographic data storage system depends to a great extent on the quality and the physical properties of the recording medium. The storage capabilities of photopolymer materials are under constant study and for some applications a high spatial frequency material is necessary. In this work, we focus on the study of the influence of 4,4ÃÂ´-Azobis(4-cyanopentanoic acid) ACPA on holographic reflection gratings recorded in a polyvinyl alcohol/acrylamide-based photopolymer with the aim of recording reflection gratings with a spatial frequency of up to 5000 lines/mm. The experimental procedure used to examine the high spatial frequency response of this material is explained and the experimental results presented.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.