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首页> 外文期刊>Optical engineering >Comparing noniterative methods for phase-only Fresnel holograms, with speckle reduction, using a low-resolution spatial-light modulator in mostly phase mode
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Comparing noniterative methods for phase-only Fresnel holograms, with speckle reduction, using a low-resolution spatial-light modulator in mostly phase mode

机译：使用大部分相位模式下的低分辨率空间光调制器比较仅相位菲涅耳全息图和减少斑点的非迭代方法

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摘要

We analyze 10 cases of noniterative methods for speckle noise reduction in phase-only hologram generation. The analyzed methods are bidirectional error diffusion, random phase-free, double-phase, random displaced phase distribution (RDPD), and complex field encoding (CFE). The first three methods have been used before in the Fresnel hologram display, whereas the last two methods have been used in the area of holographic memory recording and generation of optical fields, respectively. We study the last two methods as alternatives to the generation of a Fresnel hologram without random phase (RP) and compare their results with the first three methods. We found that the RDPD also suffers a high degradation of low frequencies, so we introduce a modification for reducing the degradation effect. This method allows control of the spread angle of the object wave propagation. We also found that the CFE achieves a precise reconstruction of the object in different planes without the addition of any RP, with a very high signal-to-noise-ratio (SNR). We compare the results of 10 cases and discuss the advantages of each one. We include the peak signal-to-noise-ratio and SNR measurements of each case. We present simulated and experimental results.
机译：我们分析了非迭代方法在仅相位全息图生成中减少斑点噪声的10种情况。分析的方法是双向误差扩散，无随机相位，双相位，随机位移相位分布（RDPD）和复数场编码（CFE）。菲涅耳全息图显示之前已使用前三种方法，而全息存储记录和光场生成领域分别使用了后两种方法。我们研究了最后两种方法，以替代无随机相位（RP）的菲涅耳全息图的生成，并将它们的结果与前三种方法进行比较。我们发现RDPD也遭受低频的高度衰减，因此我们引入了一种修改方法来降低衰减效果。该方法允许控制物波传播的扩展角。我们还发现，CFE在不增加任何RP的情况下，就可以在不同平面上精确地重建对象，并且具有很高的信噪比（SNR）。我们比较了10个案例的结果，并讨论了每个案例的优势。我们包括每种情况的峰值信噪比和SNR测量。我们提出了模拟和实验结果。

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