Nguyen Cuong M, Muhammad Dilband, Kwon Hyuk-Sang
Appl Opt. 2018 Feb 20;57(6):1504-1509. doi: 10.1364/AO.57.001504.
We describe a new method for recording spatially incoherent common-path off-axis color digital holograms. We present the theoretical and experimental evidence to demonstrate an incoherent common-path off-axis color digital holographic (ICOCH) system capable of capturing information from three-dimensional color objects under incoherent illumination, both in transmission and reflection modes. Fresnel incoherent correlation holography (FINCH), a common-path system, is a frequently used incoherent holography technique. Our proposed system is conceptually similar to an advanced form of FINCH; moreover, it has three advantages over this advanced form of FINCH. First, removal of the spatial light modulator makes our system simpler and more cost-effective. Second, removal of the polarizer or analyzer allows for greater light throughput. Third, the off-axis optical configuration enables separation of zero-order and twin images with only a single exposure per color rather than requiring three exposures per color for in-line holography FINCH. Therefore, we believe that this simple and cost-effective system with high light throughput can acquire incoherent holograms for different colors involving single exposure for each color, which makes the ICOCH system suitable for many applications.
我们描述了一种记录空间非相干共光路离轴彩色数字全息图的新方法。我们给出了理论和实验证据，以证明一种非相干共光路离轴彩色数字全息（ICOCH）系统，该系统能够在非相干照明下，以透射和反射模式从三维彩色物体捕获信息。菲涅耳非相干相关全息术（FINCH）作为一种共光路系统，是一种常用的非相干全息技术。我们提出的系统在概念上类似于FINCH的一种先进形式；此外，它相对于这种先进形式的FINCH具有三个优点。第一，去除空间光调制器使我们的系统更简单且更具成本效益。第二，去除偏振器或检偏器可实现更高的光通量。第三，离轴光学配置仅需对每种颜色进行一次曝光就能分离零级像和孪生像，而对于同轴全息术FINCH，每种颜色需要三次曝光。因此，我们认为这种具有高吞吐量的简单且经济高效的系统能够获取不同颜色的非相干全息图，每种颜色只需单次曝光，这使得ICOCH系统适用于许多应用。
