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首页> 外文期刊>Applied optics >Effect of a random pattern through a multimode-fiber bundle on angular and spatial selectivity in volume holograms: experiments and theory
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Effect of a random pattern through a multimode-fiber bundle on angular and spatial selectivity in volume holograms: experiments and theory

机译：通过多模光纤束的随机图案对体积全息图中角度和空间选择性的影响：实验和理论

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摘要

We demonstrate a multimode-fiber bundle reference scheme in a photorefractive volume hologram and discuss its angular/spatial selectivity both experimentally and theoretically. We measure the angular/spatial selectivity, changing distances between the photorefractive crystal and the output facet of the multimode-fiber bundle. The distance variation leads to a beam-size change in the reference beam, however, the object-beam size was fixed in all cases. The dependence of the angular/spatial selectivity for random-pattern (RP) referencing on a hologram dimension was examined and the characteristics compared with those derived from Gaussian referencing. Experimental results show that the RP referencing makes little contribution to the enhancement in angular selectivity, even though it leads to a considerable enhancement in spatial selectivity. The angular selectivity is mainly dependent on the dimension of a volume hologram, even with RP referencing. It is also noteworthy that the use of an RP beam can cause some high-frequency noise in the angular-multiplexing regime, which should be avoided in a hologram memory system. Nonetheless, the spatial selectivity of the RP referencing shows nearly no dependence on hologram dimension, and is mainly dependent on the transversal speckle size of the random-pattern beam. These characteristics can also be verified by the numerical results presented here, which are in good agreement with the experimental results.
机译：我们在光折变体积全息图中演示了多模光纤束参考方案，并在实验和理论上讨论了其角度/空间选择性。我们测量角度/空间选择性，改变光折变晶体与多模光纤束输出面之间的距离。距离变化会导致参考光束的光束大小发生变化，但是，在所有情况下，物体光束的大小都是固定的。考察了全息图尺寸对随机图形（RP）参考的角度/空间选择性的依赖性，并将其特性与从高斯参考得到的特性进行了比较。实验结果表明，尽管RP参考导致空间选择性的显着提高，但对角选择性的提高几乎没有贡献。即使使用RP参考，角度选择性也主要取决于体积全息图的尺寸。还值得注意的是，RP光束的使用会在角度复用方式中引起一些高频噪声，在全息图存储系统中应避免使用。尽管如此，RP参考的空间选择性几乎不依赖于全息图尺寸，而主要依赖于随机图案光束的横向散斑尺寸。这些特性也可以通过此处提供的数值结果验证，与实验结果非常吻合。

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