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Related Experiment Video

Updated: Dec 12, 2025

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Optimal modified lateral shearing interferometer with axial range extension by using a dual optical plate.

Kwang-Beom Seo, Seung-Ho Shin

    Applied Optics
    |August 14, 2020
    PubMed
    Summary

    This study introduces an optimal modified lateral shearing interferometer (MLSI) to extend the axial range of digital holographic microscopy. The dual optical plate method enables micrometer-scale measurements without phase unwrapping, improving imaging capabilities.

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    Area of Science:

    • Optics and Photonics
    • Microscopy Techniques
    • Interferometry

    Background:

    • Digital holographic microscopy (DHM) offers label-free imaging but is limited by its axial range.
    • Shearing interferometry is a technique used in microscopy, but traditional methods have limitations in axial range extension.
    • Phase unwrapping is a common challenge in holographic microscopy, requiring complex algorithms.

    Purpose of the Study:

    • To present a novel method for extending the axial range of digital holographic microscopy.
    • To introduce an optimal modified lateral shearing interferometer (MLSI) for enhanced measurement capabilities.
    • To enable micrometer-scale object measurement without the need for phase unwrapping.

    Main Methods:

    • Utilizing a dual optical plate to generate an interference pattern with two spatial wavelengths.
    • Applying Fast Fourier Transform (FFT) to transfer dual spatial frequencies to the Fourier plane.
    • Extracting dual phases and combining them to create a synthetic wavelength for measurement.
    • Implementing a noise-reducing algorithm to mitigate phase noise.

    Main Results:

    • The proposed system successfully extends the axial range of digital holographic microscopy.
    • Micrometer-scale objects were measured accurately without phase unwrapping.
    • Experimental results confirmed the feasibility and effectiveness of the optimal MLSI with a dual optical plate.
    • The noise-reducing algorithm effectively minimized phase noise.

    Conclusions:

    • The optimal MLSI with a dual optical plate is a viable method for extending the axial range in digital holographic microscopy.
    • This technique overcomes the limitations of phase unwrapping, simplifying measurements.
    • The developed system offers improved performance for micrometer-scale metrology in microscopy.