Jenney J A
Appl Opt. 1972 Jun 1;11(6):1371-81. doi: 10.1364/AO.11.001371.
An analysis is presented of the nonlinear effects of holographically recording discrete image points on a phase recording material. The analysis is restricted to thin, two- and three-beam holographic gratings recorded on a material that exhibits a linear phase shift vs exposure. Harmonics, intermodulation noise, and small signal effects are considered. Experimental measurements were carried out for three-beam holographic gratings and diffuse object holograms recorded on photopolymer recording materials. Intermodulation noise is found to be a serious limitation for discrete image point holograms, because this noise cannot be spatially separated from the desired image points. Intermodulation noise can be reduced by increasing the reference-to-object beam irradiance ratio and by reducing the diffraction efficiency. Photopolymer gratings with 50-dB signal-to-intermodulation noise ratio were obtained with diffraction efficiency greater than 1/10% at beam irradiance ratios of 400:1. The image contrast of photopolymer holograms of diffuse objects is compared with the image contrast reported for bleached silver halide emulsions.
本文对在相位记录材料上全息记录离散图像点的非线性效应进行了分析。该分析限于记录在呈现线性相移与曝光关系的材料上的薄型二光束和三光束全息光栅。考虑了谐波、互调噪声和小信号效应。对记录在光聚合物记录材料上的三光束全息光栅和漫射物体全息图进行了实验测量。发现互调噪声是离散图像点全息图的一个严重限制，因为这种噪声无法在空间上与所需图像点分离。可以通过增加参考光束与物光束的辐照度比以及降低衍射效率来降低互调噪声。在光束辐照度比为400:1时，获得了信号与互调噪声比为50 dB、衍射效率大于1/10%的光聚合物光栅。将漫射物体光聚合物全息图的图像对比度与报道的漂白卤化银乳剂的图像对比度进行了比较。
