Increased depth of focus in random-phase-free holographic projection
Increased depth of focus in random-phase-free holographic projection
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DOI：
10.3788/col201614.120901
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发表时间：
2016-12
影响因子：
3.5
通讯作者：
M. Makowski;T. Shimobaba;T. Ito
中科院分区：
文献类型：
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作者：
M. Makowski;T. Shimobaba;T. Ito
最近提出的无随机相位方法使全息重建具有非常低的噪声，这允许精细的投影没有时间积分的子全息图。在这里，我们描述了这种方法的额外优势，即，扩展的深度清晰成像。这可以归因于在投影屏幕处形成给定像点的全息图部分的较低有效孔径。实验比较了无随机相位法和无随机相位法在不同离焦参数下的焦深和成像分辨率。此外，我们还讨论了在全息图平面内存在局部障碍物时有效孔径的影响。
The recently proposed random-phase-free method enables holographic reconstructions with very low noise, which allows fine projections without time integration of sub-holograms. Here, we describe the additional advantage of this method, namely, the extended depth of sharp imaging. It can be attributed to a lower effective aperture of the hologram section forming a given image point at the projection screen. We experimentally compare the depth of focus and imaging resolution for various defocusing parameters in the cases of the random-phase method and the random-phase-free method. Moreover, we discuss the influence of the effective aperture in the presence of local obstacles in the hologram’s plane.