20 January 2006 Phase-shifting digital holography using two low-coherence light sources with different wavelength
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Proceedings Volume 6027, ICO20: Optical Information Processing; 60274V (2006) https://doi.org/10.1117/12.668627
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
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.
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Yoshio Hayasaki, Shingo Tamano, Masaki Yamamoto, Nobuo Nishida, "Phase-shifting digital holography using two low-coherence light sources with different wavelength", Proc. SPIE 6027, ICO20: Optical Information Processing, 60274V (20 January 2006); doi: 10.1117/12.668627; https://doi.org/10.1117/12.668627
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