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

C. H.O. Janghyun, L. I.M. Jinsang, Sungbin Jeon, Guk Jong Choi, Hyungbae Moon, No Cheol Park, Young Pil Park

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2123-2131
Number of pages9
JournalOptics Express
Volume26
Issue number2
DOIs
Publication statusPublished - 2018 Jan 22

Bibliographical note

Funding Information:
National Research Foundation of Korea (NRF) (2015R1A5A1037668).

Publisher Copyright:
© 2018 Optical Society of America.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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