Publication

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

Christian Depeursinge, Etienne Cuche
2000
Journal Articles

Abstract

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. (C) 2000 Optical Society of America OCIS codes: 090.0090, 090.1760, 070.2580, 100.2000, 040.1520. Univ Lausanne, Dept Neurol, Inst Physiol, Lab Neurol Res, CH-1005 Lausanne, Switzerland.

Official source

https://infoscience.epfl.ch/entities/publication/b62df781-2757-4440-b587-4c51b6ba153b

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Christian Depeursinge, Etienne Cuche
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b62df781-2757-4440-b587-4c51b6ba153b

About this result

Related concepts (32)

Kirchhoff's diffraction formula

Kirchhoff's diffraction formula (also called Fresnel–Kirchhoff diffraction formula) approximates light intensity and phase in optical diffraction: light fields in the boundary regions of shadows. The approximation can be used to model light propagation in a wide range of configurations, either analytically or using numerical modelling. It gives an expression for the wave disturbance when a monochromatic spherical wave is the incoming wave of a situation under consideration.

Huygens–Fresnel principle

The Huygens–Fresnel principle (named after Dutch physicist Christiaan Huygens and French physicist Augustin-Jean Fresnel) states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. The sum of these spherical wavelets forms a new wavefront. As such, the Huygens-Fresnel principle is a method of analysis applied to problems of luminous wave propagation both in the far-field limit and in near-field diffraction as well as reflection.

Fresnel number

The Fresnel number (F), named after the physicist Augustin-Jean Fresnel, is a dimensionless number occurring in optics, in particular in scalar diffraction theory. For an electromagnetic wave passing through an aperture and hitting a screen, the Fresnel number F is defined as where is the characteristic size (e.g. radius) of the aperture is the distance of the screen from the aperture is the incident wavelength.

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

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