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Digital phase contrast with the fractional Fourier transform

Abstract : A new method of digital phase contrast based on fractional-order Fourier reconstruction is proposed. We show that the diffraction patterns produced by pure phase objects exhibit linear chirp functions that can be advantageously processed using the fractional Fourier transform. The optimal fractional orders lead to the longitudinal location of the phase object, while the analysis of the reconstructed pattern leads to its diameter and to the value of the phase shift. Simulations and experimental results are given. The configuration tested in this paper is a very general Gaussian illumination.
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https://hal-cea.archives-ouvertes.fr/cea-00359143
Contributor : Chantal Brassy <>
Submitted on : Thursday, February 5, 2009 - 7:52:48 PM
Last modification on : Friday, May 10, 2019 - 11:46:02 AM

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  • HAL Id : cea-00359143, version 1

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Marc Brunel, Sébastien Coëtmellec, Denis Lebrun, Kamel Aït Ameur. Digital phase contrast with the fractional Fourier transform. Applied optics, Optical Society of America, 2009, 48, pp.579-583. ⟨cea-00359143⟩

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