Di Jianglei, Zhao Jianlin, Jiang Hongzhen, Zhang Peng, Fan Qi, Sun Weiwei
Institute of Optical Information Science and Technology, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
Appl Opt. 2008 Oct 20;47(30):5654-9. doi: 10.1364/ao.47.005654.
Theoretical analysis shows that, to improve the resolution and the range of the field of view of the reconstructed image in digital lensless Fourier transform holography, an effective solution is to increase the area and the pixel number of the recorded digital hologram. A new approach based on the synthetic aperture technique and use of linear CCD scanning is presented to obtain digital holographic images with high resolution and a wide field of view. By using a synthetic aperture technique and linear CCD scanning, we obtained digital lensless Fourier transform holograms with a large area of 3.5 cm x 3.5 cm (5000 x 5000 pixels). The numerical reconstruction of a 4 mm object at a distance of 14 cm by use of a Rayleigh-Sommerfeld integral shows that a theoretically minimum resolvable distance of 2.57 microm can be achieved at a wavelength of 632.8 nm. The experimental results are consistent with the theoretical analysis.
理论分析表明，在数字无透镜傅里叶变换全息术中，为提高重建图像的分辨率和视场范围，一种有效的解决方法是增加记录数字全息图的面积和像素数量。提出了一种基于合成孔径技术和线性电荷耦合器件（CCD）扫描的新方法，以获得具有高分辨率和宽视场的数字全息图像。通过使用合成孔径技术和线性CCD扫描，我们获得了面积为3.5厘米×3.5厘米（5000×5000像素）的大面积数字无透镜傅里叶变换全息图。利用瑞利 - 索末菲积分对距离为14厘米处的4毫米物体进行数值重建表明，在波长为632.8纳米时，理论上可实现的最小可分辨距离为2.57微米。实验结果与理论分析一致。
