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Proceedings Paper

Phase-shifting digital holography using two low-coherence light sources with different wavelength
Author(s): Yoshio Hayasaki; Shingo Tamano; Masaki Yamamoto; Nobuo Nishida
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Paper Abstract

To observe an object shape in a light scattering medium, the low-coherence interferometry exercises its power to omit undesired light derived from multiple-light scattering. The phase-shifting digital holography is used to obtain the complex amplitude of the object from a few interference patterns. When the object has a height difference more than the wavelength of a light source, the obtained phase distribution has 2π ambiguity. Therefore, a phase-unwrapping technique is required to contour the object surface. When an object is in light-scattering media, the interference signal has much noise originating from multiple-light scattering, and therefore the phase unwrapping becomes harder. Two-wavelength interferometry set free from the unwrapping procedure. We propose a new method based on a combination of the phase-shifting digital holography, the two-wavelength interferometry, and the low-coherence interferometry. We demonstrate a topographic imaging of an object in light scattering media.

Paper Details

Date Published: 20 January 2006
PDF: 7 pages
Proc. SPIE 6027, ICO20: Optical Information Processing, 60274V (20 January 2006); doi: 10.1117/12.668627
Show Author Affiliations
Yoshio Hayasaki, The Univ. of Tokushima (Japan)
Shingo Tamano, The Univ. of Tokushima (Japan)
Masaki Yamamoto, The Univ. of Tokushima (Japan)
Nobuo Nishida, The Univ. of Tokushima (Japan)

Published in SPIE Proceedings Vol. 6027:
ICO20: Optical Information Processing
Yunlong Sheng; Songlin Zhuang; Yimo Zhang, Editor(s)

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