Zhang Junjie, Liu Yiwei, Cui Wanying, Jiang Zhuqing
Appl Opt. 2024 May 10;63(14):3922-3928. doi: 10.1364/AO.520086.
A fractional Fourier-transform digital holographic imaging method with resolution enhancement features is presented. In an optical configuration, an extended fractional Fourier-transform optical setup is set in the object arm of an off-axis digital holographic recording system to record a fractional Fourier-transform hologram via the optical interference of the fractional Fourier-transform wavefront of an object wave with a reference wave. For reconstruction imaging, the reconstruction approach for fractional Fourier-transform holograms is given. In the experiment, the fractional Fourier-transform digital holograms are recorded under the different recording parameters, and their amplitude images are effectively reconstructed. The imaging results demonstrate that the reconstruction-imaging resolution of fractional-order Fourier-transform holograms is obviously enhanced compared to that of conventional image-plane holograms. The presented fractional Fourier-transform digital holographic imaging with resolution enhancement and optical configuration flexibility provides, to our knowledge, a novel way for off-axis digital holographic imaging.
提出了一种具有分辨率增强特性的分数傅里叶变换数字全息成像方法。在光学配置中，在离轴数字全息记录系统的物臂中设置扩展的分数傅里叶变换光学装置，通过物波的分数傅里叶变换波前与参考波的光学干涉来记录分数傅里叶变换全息图。对于重建成像，给出了分数傅里叶变换全息图的重建方法。在实验中，在不同记录参数下记录分数傅里叶变换数字全息图，并有效重建其振幅图像。成像结果表明，与传统像面全息图相比，分数阶傅里叶变换全息图的重建成像分辨率明显提高。据我们所知，所提出的具有分辨率增强和光学配置灵活性的分数傅里叶变换数字全息成像为离轴数字全息成像提供了一种新方法。
