实验研究探测器大小与散焦长度对无透镜鬼衍射的影响

无透镜鬼衍射是一种特殊的非局域关联成像技术，通过对包含物体信息的测试光路和不含物体信息的参考光路的光场强度涨落关联进行测量，在参考光路上可得到物体的衍射图样。利用赝热光源实验研究了探测器尺寸大小和光路散焦长度对无透镜鬼衍射质量的影响。实验以四缝物体为例，定量研究了探测器大小和散焦是如何改变无透镜鬼衍射的成像结果，并和理论模拟进行了比较，获得了比较一致的结果。利用图像相关度定量分析了实验结果与理想无透镜鬼衍射图像的差别，发现这两者都会使无透镜鬼衍射的质量变差。

Abstract

Lensless ghost diffraction is a kind of correlated imaging technique that produces the diffraction pattern of the object on the reference path by measuring the correlation of intensity fluctuation between the test and reference paths, in which the test path contains the object. The effects of the detector size and defocusing length on lensless ghost diffraction imaging with pseudo-thermal light are investigated experimentally. Using a four-slit object in our experiments, how the detector size and defocusing length change the patterns of lensless ghost diffraction is quantitatively studied. The experimental results are well interpreted with the numerical simulations. The image correlation is used to quantitatively analyze the differences between the experimental patterns and the idealized ghost diffraction images. It is found the diffraction quality is decreased with the appearance of the finite size of the detector and the defocusing length.

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罗春伶, 林洁, 程静. 实验研究探测器大小与散焦长度对无透镜鬼衍射的影响[J]. 光学学报, 2012, 32(11): 1104001. Luo Chunling, Lin Jie, Cheng Jing. Experimental Investigation on the Effects of the Detector Size and Defocusing Length on Lensless Ghost Diffraction[J]. Acta Optica Sinica, 2012, 32(11): 1104001.

实验研究探测器大小与散焦长度对无透镜鬼衍射的影响

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