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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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Widefield quantitative phase imaging by second-harmonic dispersion interferometry.

Fernando Brandi, Frank Wessel

    Optics Letters
    |August 1, 2020
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    Summary
    This summary is machine-generated.

    This study introduces a new widefield quantitative phase-imaging technique for transparent samples. It achieves high sensitivity and resolution, enabling advanced diagnostics and label-free biological imaging.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Plasma Physics

    Background:

    • Optical imaging of transparent samples is challenging due to lack of intensity contrast.
    • Qualitative phase-contrast imaging is established, but quantitative methods offer more detailed information.
    • Widefield imaging is crucial for diagnostics in fields like gas flow, plasma, and biological sciences.

    Purpose of the Study:

    • To demonstrate a novel widefield quantitative phase-imaging technique.
    • To overcome limitations of intensity-based imaging for transparent media.
    • To provide a stable, implementable optical configuration for high-resolution phase imaging.

    Main Methods:

    • Utilizing fully common-path second-harmonic dispersion interferometry.
    • Employing pixel-by-pixel homodyne dual-channel polarization-dependent phase detection.
    • Integrating a laser system for time-resolved measurements.

    Main Results:

    • Achieved sub-10 mrad harmonic phase dispersion sensitivity.
    • Demonstrated spatial resolution of several tens of microns.
    • Attained a time resolution of 600 ps, limited by laser pulse duration.

    Conclusions:

    • The developed technique offers a robust solution for quantitative phase imaging of transparent samples.
    • The method is suitable for harsh environments and various diagnostic applications.
    • This advancement facilitates label-free imaging and detailed analysis in scientific research.