Muroi Tetsuhiko, Kinoshita Nobuhiro, Ishii Norihiko, Kamijo Koji, Kikuchi Hiroshi, Kawata Yoshimasa, Shimidzu Naoki
Science & Technology Research Laboratories, Japan Broadcasting Corporation (NHK), 10-11 Kinuta 1-chome, Tokyo, 157-8510, Japan. muroi.t‐
Appl Opt. 2011 Oct 10;50(29):5700-9. doi: 10.1364/AO.50.005700.
We are studying a form of holographic data storage with phase conjugation, and we compensated for hologram distortion due to shrinkage of photopolymer materials in the holographic medium by controlling the wavefront of the reference beam. When a high NA lens and narrow angle interval of angle multiplexing are employed to obtain a high data recording density, some wavefronts cause interpage crosstalk on the reconstructed image. We tried to determine the moving range of actuators in a deformable mirror for controlling the wavefront. As a result, we found that the distortion in the hologram could be compensated while avoiding interpage crosstalk and that the bit error rates of the reproduced data could be decreased. We also found that the optimized wavefront could compensate for distortions in several neighboring data pages. This method can ensure a high data recording density in holographic data storage.
我们正在研究一种具有相位共轭的全息数据存储形式，并且通过控制参考光束的波前，补偿了由于全息介质中光聚合物材料收缩而导致的全息图失真。当采用高数值孔径透镜和窄角度复用间隔来获得高数据记录密度时，一些波前会在重建图像上引起页面间串扰。我们试图确定用于控制波前的可变形镜中致动器的移动范围。结果，我们发现可以在避免页面间串扰的同时补偿全息图中的失真，并且可以降低再现数据的误码率。我们还发现，优化的波前可以补偿几个相邻数据页面中的失真。这种方法可以确保全息数据存储中的高数据记录密度。
