Open AccessDual-wavelength off-axis digital holography using a single light-emitting diode
Author(s) -
Janghyun Cho,
Jihwan Lim,
Sungbin Jeon,
Guk-Jong Choi,
Hyungbae Moon,
No−Cheol 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.