Dual-wavelength off-axis digital holography using a single light-emitting diode

We propose a new low-coherence interferometry system for dual-wavelength off-axis digital holography. By utilizing diffraction gratings, two beams with narrower bandwidths and different center wavelengths could be filtered in a single light-emitting diode. The characteristics of the system are analy...

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Bibliographic Details
Published in:Optics express 2018-01, Vol.26 (2), p.2123-2131
Main Authors: Cho, Janghyun, Lim, Jinsang, Jeon, Sungbin, Choi, Guk-Jong, Moon, Hyungbae, Park, No-Cheol, Park, Young-Pil
Format: Article
Language:English
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Summary:We propose a new low-coherence interferometry system for dual-wavelength off-axis digital holography. By utilizing diffraction gratings, two beams with narrower bandwidths and different center wavelengths could be filtered in a single light-emitting diode. The characteristics of the system are analytically determined to extend the coherence length and field-of-view enough for off-axis configuration. The proposed system enables the fast and accurate measurement of the surface profile with more than a micrometer step height and less noise. The performance of the system is verified by the experimental results of a standard height sample.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.002123