Spatial filtering for zero-order and twin-image elimination in digital off-axis holography

被引:0
|
作者
Cuche, Etienne [1 ]
Marquet, Pierre [2 ]
Depeursinge, Christian [1 ]
机构
[1] Institute of Applied Optics, Swiss Fed. Institute of Technology, CH-1015 Lausanne, Switzerland
[2] Laboratory of Neurological Research, Institute of Physiology, University of Lausanne, CH-1005 Lausanne, Switzerland
来源
Applied Optics | 2000年 / 39卷 / 23期
关键词
Cameras - Charge coupled devices - Fourier transforms - Frequencies - Holograms - Light reflection - Optical filters;
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中图分类号
学科分类号
摘要
Off-axis holograms recorded with a CCD camera are numerically reconstructed with a calculation of scalar diffraction in the Fresnel approximation. We show that the zero order of diffraction and the twin image can be digitally eliminated by means of filtering their associated spatial frequencies in the computed Fourier transform of the hologram. We show that this operation enhances the contrast of the reconstructed images and reduces the noise produced by parasitic reflections reaching the hologram plane with an incidence angle other than that of the object wave. © 2000 Optical Society of America.
引用
收藏
页码:4070 / 4075
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