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首页> 外文会议>Practical holography XXXI: materials and applications >Angular multiplexing holograms of four images recorded on photopolymer films with recording-film-thickness-dependent holographic characteristics
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Angular multiplexing holograms of four images recorded on photopolymer films with recording-film-thickness-dependent holographic characteristics

机译：具有与记录膜厚度相关的全息特性的光聚合物膜上记录的四个图像的角多路复用全息图

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In this study, angular multiplexing hologram recording photopolymer films were studied experimentally. The films contained acrylamide as a monomer, eosin Y as a sensitizer, and triethanolamine as a promoter in a polyvinyl alcohol matrix. In order to determine the appropriate thickness of the photopolymer films for angular multiplexing, photopolymer films with thicknesses of 29-503 μm were exposed to two intersecting beams of a YVO laser at a wavelength of 532 nm to form a holographic grating with a spatial frequency of 653 line/mm. The diffraction efficiencies as a function of the incident angle of reconstruction were measured. A narrow angular bandwidth and high diffraction efficiency are required for angular multiplexing; hence, we define the Q value, which is the diffraction efficiency divided by half the bandwidth. The Q value of the films depended on the thickness of the films, and was calculated based on the measured diffraction efficiencies. The Q value of a 297-um-thick film was the highest of the all films. Therefore, the angular multiplexing experiments were conducted using 300-μm-thick films. In the angular multiplexing experiments, the object beam transmitted by a square aperture was focused by a Fourier transform lens and interfered with a reference beam. The maximum order of angular multiplexing was four. The signal intensity that corresponds to the squared-aperture transmission and the noise intensity that corresponds to transmission without the square aperture were measured. The signal intensities decreased as the order of angular multiplexing increased, and the noise intensities were not dependent on the order of angular multiplexing.
机译：在这项研究中，对角复用全息图记录光敏聚合物膜进行了实验研究。该膜在聚乙烯醇基体中包含丙烯酰胺作为单体，曙红Y作为敏化剂和三乙醇胺作为促进剂。为了确定用于角度多路复用的光敏聚合物膜的适当厚度，将厚度为29-503μm的光敏聚合物膜暴露于波长为532 nm的YVO激光的两个相交光束中，以形成空间频率为的全息光栅。 653线/毫米测量衍射效率与重建入射角的关系。角度多路复用需要窄的角度带宽和高的衍射效率。因此，我们定义了Q值，即衍射效率除以带宽的一半。膜的Q值取决于膜的厚度，并基于测得的衍射效率来计算。 297微米厚的胶片的Q值是所有胶片中最高的。因此，使用300μm厚的薄膜进行了角复用实验。在角度多路复用实验中，由方形孔径透射的目标光束被傅立叶变换透镜聚焦，并与参考光束发生干涉。角复用的最大阶数为4。测量对应于平方孔径透射率的信号强度和对应于没有平方孔径的透射率的噪声强度。信号强度随着角复用的顺序增加而降低，并且噪声强度不依赖于角复用的顺序。

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