Kaur Rajveer, Park Jae-Hyeung, Kumar Raj
J Opt Soc Am A Opt Image Sci Vis. 2024 Mar 1;41(3):A15-A24. doi: 10.1364/JOSAA.507415.
Due to shrinkage in photopolymer materials, the angle of the reconstruction beam in holographic optical elements (HOEs) does not match with the Bragg condition, resulting in a decreased amount of light in the desired direction or loss of transmitted information to rematch the Bragg condition. Thus, to ensure final display features it is imperative to precompensate the shrinkage effect. We derived simplified expressions for precompensation in recording geometries of required HOEs in holographic waveguide-based Maxwellian near eye displays. An acceptable range of detuning from the Bragg angle is also analyzed. The experimentally measured 4.95% shrinkage in photopolymer film for 0° and 45° recording angles of beams was precompensated using -0.86 and 43.7° recording angles. Theoretical results are validated through simulation and experiments.
由于光聚合物材料的收缩，全息光学元件（HOE）中重建光束的角度与布拉格条件不匹配，导致所需方向上的光量减少或传输信息丢失，无法重新匹配布拉格条件。因此，为确保最终显示特性，必须对收缩效应进行预补偿。我们推导了基于全息波导的麦克斯韦近眼显示器中所需HOE记录几何结构的预补偿简化表达式。还分析了与布拉格角失谐的可接受范围。对于光束0°和45°的记录角度，使用-0.86和43.7°的记录角度对光聚合物薄膜中实验测量的4.95%的收缩进行了预补偿。理论结果通过模拟和实验得到验证。
