光路几何配置对体全息存储角度复用度的影响

Influence of beam path geometrical arrangement on angular multiplex density in volume holographic storage

利用耦合波理论对体全息存储角度复用方式的基本原理进行了讨论,分析了对称写入、非对称写入及邻面写入等不同光路几何配置对角度复用度的影响。考虑存储介质临界角的限制,推导出最大角度复用度的计算公式。理论分析及数值模拟表明:非对称入射光路比对称入射光路更有利于提高系统的角度复用度;邻面入射光路的角度复用度最高且与参考光入射角改变量成正比,邻面入射光路是最佳的角度复用存储光路。

Based on coupled-wave theory, the fundamental principle of angular multiplex in volume holographic storage is discussed. The influence of the different beam path geometric arrangements, such as symmetrical write, unsymmetrical write and near-plane write, on the angular multiplex density was analyzed. Considering the limitation of total reflection about storage material, the equation of maximum angular multiplex density was derived. The theoretical analysis and digital simulation results indicate that the unsymmetrical incident light path has a higher angular multiplex density than the symmetrical one, and the angular multiplex density of the near-plane incident beam path is the best and is directly proportional to the reference beam.