search for




 

https://doi.org/10.3938/NPSM.68.1378
A Phase Unwrapping Algorithm in Three-Wavelength Digital Holographic Microscopy
New Phys.: Sae Mulli 2018; 68: 1378~1383
Published online December 31, 2018;  https://doi.org/10.3938/NPSM.68.1378
© 2018 New Physics: Sae Mulli.

Sanghoon SHIN1, Younghun YU*2

1 Kanghae Precision System, Hwaseong 18487, Korea
2 Department of Physics and Research Institute for Basic Sciences, Jeju National University, Jeju 63243, Korea
Correspondence to: yyhyoung@jejunu.ac.kr
Received September 11, 2018; Revised October 29, 2018; Accepted October 30, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Multi-wavelength holography has a better axial range than single-wavelength holography, thus allowing unambiguous phase imaging. Noise amplification is the limiting factor in multi-wavelength holography as noise is amplified by a factor equivalent to the magnification of the wavelengths. Here, we propose a new algorithm to remove noise amplification in multi-wavelength holography. The proposed method does not use phase unwrapping and removes 2$\pi$ ambiguities. Experiments and numerical simulations indicated that the proposed method is fast, has low noise, and is useful for measuring samples with arbitrary step heights.
PACS numbers: 42.40.Kw, 42.40.-i, 07.60.Pb
Keywords: Digital holography, Three-wavelength holography, Noise reduction


December 2018, 68 (12)
  • Scopus
  • CrossMark