The effect of defocusing due to the finite thickness of the crystal, in which parametric scattering occurs, on the spatial resolution of ghost images is considered. The necessary relationships are presented, and methods of levelling this distorting factor and improving the quality of ghost images are proposed.

中文翻译：

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散焦对量子幻影图像质量的影响

考虑到由于有限的晶体厚度而导致的散焦对重影图像的空间分辨率的影响。提出了必要的关系，并提出了均衡该失真因子和改善重影图像质量的方法。