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A Phase Unwrapping Algorithm in Three-Wavelength Digital Holographic Microscopy

  • Shin, Sanghoon (Kanghae Precision System) ;
  • Yu, Younghun (Department of Physics and Research Institute for Basic Sciences, Jeju National University)
  • Received : 2018.09.11
  • Accepted : 2018.10.30
  • Published : 2018.12.31

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.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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