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An important issue in developing applications for photopolymers in holography is the effect of shrinkage on recording properties. In this paper, we introduce a model to describe real-time formation of a single grating in photopolymers at any geometrical angle, under the assumption that the shrinkage is in proportion to the polymerization. This model combines polymerization kinetics with the coupled-wave theory, explaining the shrinkage effect on the diffraction efficiency. The model is validated by comparing its predictions with the experimental results for a film of 99μm thickness. 相似文献
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通过分析现用激光测头光学系统中所存在的制约测量范围与测量精度的问题,本文提出用二元长焦深、高分辨率器件取代传统准直透镜以提高测头技术性能,并详细推导了此二元器件的设计方法,给出了相位函数表达式。通过对一个设计实例的轴上光斑变化和光能分布情况的模拟计算,并与传统透镜相比较,说明这种二元器件用作准直透镜能够提高激光测头的技术性能。表明二元光学器件用于不接触测量系统具有巨大优势。 相似文献
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