Abstract

Problems arising when recording holograms in volume materials and manifesting themselves, firstly, as the spatial resonance of the hologram recording field with refractive index inhomogeneities caused by this recording are considered. Secondly, they manifest themselves as cross-coupling of two nonlinearities in the process of holographic recording—nonlinearity of the diffraction efficiency and nonlinearity of the distribution of the exposure and visibility recorded by the holographic grating over the hologram field. It is noted that the appearance of one more nonlinearity—the nonlinear photoresponse of the holographic material—leads not to a decrease in the diffraction efficiency but to an increase in it under certain conditions. In this work, main classes of volume holographic materials are distinguished—relaxation free dynamic media and media with development. Restrictions of the maximum achievable diffraction efficiency for both types of the media are demonstrated. Recommendations on elimination of undesirable consequences of the revealed effects are formulated. The recommendations are based on the analysis of main regularities in the formation of the photoresponse with allowance for the spatial resonance and presence of the formfactor.

中文翻译：

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空间光响应，外形和对全息材料的要求

摘要

考虑到在体积材料中记录全息图并表现出来时首先出现的问题，首先是全息记录场的空间共振与由该记录引起的折射率不均匀。其次，它们表现为全息记录过程中两个非线性的交叉耦合-衍射效率的非线性和全息光栅在全息图场上记录的曝光和可见度分布的非线性。要注意的是，出现了另一种非线性-全息材料的非线性光响应-不会导致衍射效率的降低，而是导致在某些条件下衍射效率的提高。在这项工作中 体积全息材料的主要类别是杰出的-无松弛动态媒体和发展中的媒体。证明了两种介质都可达到的最大衍射效率的限制。制定了有关消除所显示效应的不良后果的建议。这些建议基于对光响应形成过程中主要规律的分析，并考虑了空间共振和形状因数的存在。