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Phase retrieval in low-coherence interferometric microscopy.

Audrey K Ellerbee1, Joseph A Izatt

  • 1Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA. ake4@duke.edu

Optics Letters
|March 16, 2007
PubMed
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We developed new methods to fix errors in quantitative phase reporting for low-coherence interferometry. This improves optical path length measurements, crucial for Doppler imaging and cell analysis.

Area of Science:

  • Optical Physics
  • Biomedical Optics
  • Interferometry

Background:

  • Quantitative phase imaging (QPI) techniques often suffer from inherent errors.
  • Phase leakage can degrade the accuracy of optical path length (OPL) measurements, especially near closely spaced reflectors.

Purpose of the Study:

  • To present compensating methods for inherent errors in quantitative phase reporting.
  • To mitigate the effects of phase leakage on OPL measurements in low-coherence interferometry.

Main Methods:

  • Theoretical treatment of phase errors in low-coherence interferometry.
  • Experimental validation using spectral domain phase microscopy (SDPM).
  • Demonstration of corrected phase retrieval for OPL conversion.

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Main Results:

  • Developed and validated compensating methods to address phase leakage.
  • Successfully mitigated degrading effects of phase leakage on OPL measurements near closely spaced reflectors.
  • Demonstrated accurate OPL conversion from interferometric phase in biological samples.

Conclusions:

  • The presented methods effectively correct inherent errors in quantitative phase reporting.
  • Accurate OPL measurements are achievable even in the presence of phase leakage.
  • This work has direct implications for phase-sensitive interferometry and quantitative amplitude-based reporting, including cell surface deflection analysis.