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Proceedings Paper

Imaging micro-optical components with short coherent digital holographic microscopy
Author(s): S. Stuerwald; R. Schmitt
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Paper Abstract

The application of digital holographic microscopy offers quantitative phase contrast imaging of reflective and (partially) transparent samples. Low coherent light sources enable an increased resolution in phase shifting digital holography by the reduction of stray light and multiple reflections in the experimental interferometer setup. Therefore light emitting diodes (LED) are utilized. Here, the effects on the reconstruction quality by considering the whole spectrum of the light source are investigated. Furthermore, the propagation of the complex wave fronts, which are determined by digital holography, and used for re- and multifocusing, is modified to light sources with a spectral width wider than that of typical laser light sources. Therefore, the propagation algorithm using the convolution method as a solution of the Fresnel-Kirchhoff diffraction integral according to the first Rayleigh-Sommerfeld approximation is extended by an additional integral to take into account the spectral width of low coherent light sources. Numerically, in the new approach the supplementary integral is realized by a discrete sum considering a finite set of wavelengths. Specifically, the results of the modified algorithm are compared with common algorithms with respect to resolution and image sharpness.

Paper Details

Date Published: 14 May 2010
PDF: 8 pages
Proc. SPIE 7717, Optical Modelling and Design, 77170O (14 May 2010); doi: 10.1117/12.854674
Show Author Affiliations
S. Stuerwald, Fraunhofer Institute for Production Technology (Germany)
R. Schmitt, Fraunhofer Institute for Production Technology (Germany)

Published in SPIE Proceedings Vol. 7717:
Optical Modelling and Design
Frank Wyrowski; John T. Sheridan; Jani Tervo; Youri Meuret, Editor(s)

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