论文标题
在增强的NA菲涅耳全息显示中扩展图像空间
Expansion of image space in enhanced-NA Fresnel holographic display
论文作者
论文摘要
增强的Na菲涅尔全息图以大于全息像素的衍射角的视角重建全息图像。图像空间受数字全息图的带宽限制。在这项研究中，我们研究了衍射区以外的扩展图像空间中图像形成的特性。进行使用相位菲涅尔全息图的数值模拟，以观察图像空间的扩展以及该图对角度视野的变化的影响。通过将角度视图范围限制为衍射角来合成的相位菲涅尔全息图可以重建一个均匀的图像，而在主要观看区内没有高阶噪声，这通过光学实验得到了很好的证实。另一方面，当视角取决于全息图数值光圈时，高阶图像的重叠是不可避免的。高阶图像分布在余弦方向上，可以通过角度低通滤波器有效地去除。我们讨论了扩展图像空间的方法的开发，同时保持全息图像的视角。
The enhanced-NA Fresnel hologram reconstructs a holographic image at a viewing angle larger than the diffraction angle of a hologram pixel. The image space is limited by the bandwidth of a digital hologram. In this study, we investigate the property of image formation in the extended image space beyond a diffraction zone. A numerical simulation using the phase Fresnel hologram is carried out to observe an extension of image space and the effect of this on the changes in the angular field of view. The phase Fresnel hologram, synthesized by restricting the angular view range to a diffraction angle, can reconstruct a uniform image without high-order noises within the primary viewing zone, which is well confirmed by optical experiments. On the other hand, the overlapping of high-order images is inevitable when the viewing angle depends on the hologram numerical aperture. The high-order images are distributed in the direction cosine space, which could be effectively removed through an angular low-pass filter. We discuss the development of method for expanding the image space while maintaining the viewing angle of a holographic image.
