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

Janghyun Cho | Zendy; Jinsang Lim | Zendy; Sungbin Jeon | Zendy; Guk-Jong Choi | Zendy; Hyungbae Moon | Zendy; NoCheol Park | Zendy; Young-Pil Park | Zendy

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

Author(s) -

Janghyun Cho,

Jinsang Lim,

Sungbin Jeon,

Guk-Jong Choi,

Hyungbae Moon,

NoCheol Park,

Young-Pil Park

Publication year - 2018

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.002123

Subject(s) - optics , holography , superluminescent diode , wavelength , interferometry , coherence (philosophical gambling strategy) , diffraction , physics , digital holography , diffraction grating , optical coherence tomography , materials science , quantum mechanics

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.

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