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Proceedings Paper

Three-dimensional coherence holography using a commercial projector for display and incoherent illumination of a coherence hologram
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Paper Abstract

We propose a simple implementation of off-axis coherence holography with a commercial projector combined with a Sagnac radial shearing interferometer. The projector functions as a device for display and incoherent illumination of a coherence hologram, which permits reconstruction of the hologram with a generic spatially-incoherent quasimonochromatic thermal light source. The Sagnac radial shearing interferometer, with its inherent stability of a common-path interferometer and controllable magnification introduced by variable shear, functions as a device for correlating optical fields to detect the 3-D coherence function that represents the object recorded in the coherence hologram. A set of phase-shifted Fourier transform holograms was displayed sequentially with the projector. The coherence function was detected by applying the phase-shift technique to the Sagnac radial shearing interferometer, and the object was reconstructed as the 3-D correlation map of the fields diffracted from the hologram. The technique can be applied for dispersion-free spatial coherence tomography and profilometry.

Paper Details

Date Published: 2 August 2010
PDF: 8 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900Q (2 August 2010); doi: 10.1117/12.858786
Show Author Affiliations
Dinesh N. Naik, The Univ. of Electro-Communications (Japan)
Takahiro Ezawa, The Univ. of Electro-Communications (Japan)
Rakesh Kumar Singh, The Univ. of Electro-Communications (Japan)
Yoko Miyamoto, The Univ. of Electro-Communications (Japan)
Mitsuo Takeda, The Univ. of Electro-Communications (Japan)

Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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