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Proceedings Paper

Methods of digital holography: a comparison
Author(s): Thomas M. Kreis; Mike Adams; Werner P. O. Jueptner
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Paper Abstract

Optically generated holograms can be recorded on CCD-arrays if the sampling theorem is obeyed. The digitized and quantized holograms are processed digitally for the reconstruction of intensity and phase of the real or virtual image. This digital reconstruction consists in a numerical realization of the diffraction integral One approach is the Fresnel approximation employing a single Fourier transform, the other is the interpretation of the diffraction formula as a convolution integral and calculation of this convolution by a double or triple Fourier transform. In this convolution approach the impulse response of free space propagation has to be defined which is then Fourier transformed or the free space transfer function is defined immediately. Impulse response as well as transfer function can be defined exactly or in an approximated version. The main difference between the Fresnel and the convolution approach is the different size of the resulting images. Furthermore in the Fresnel case this size depends on the wavelength and the distance of the object from the CCD, in the other case it does not. In this paper consequences on the reconstructed wavefields and on the interference phase distributions of holographic interferometry are indicated and demonstrated by experimental results.

Paper Details

Date Published: 17 September 1997
PDF: 10 pages
Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); doi: 10.1117/12.281164
Show Author Affiliations
Thomas M. Kreis, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Mike Adams, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Werner P. O. Jueptner, Bremer Institut fuer Angewandte Strahltechnik (Germany)

Published in SPIE Proceedings Vol. 3098:
Optical Inspection and Micromeasurements II
Christophe Gorecki, Editor(s)

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