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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Optical phase step method for absolute ranging interferometry using computer-generated holograms.

M Deininger, L Wang, K Gerstner

    Applied Optics
    |November 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces computer-generated holograms for parallel phase steps in interferometric measurements, simplifying object distance evaluation without altering the reference path.

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    Area of Science:

    • Optics and Photonics
    • Metrology

    Background:

    • Interferometric measurements are crucial for precise distance evaluation.
    • Determining object distance from interference functions presents a significant challenge.
    • The phase step method is a known technique for obtaining object phase information.

    Purpose of the Study:

    • To present a novel method for parallel phase steps in interferometric measurements.
    • To simplify the evaluation of object distance.
    • To avoid phase modulation of the reference path.

    Main Methods:

    • Utilizing computer-generated holograms (CGHs).
    • Implementing parallel phase steps.
    • Performing interferometric measurements without reference path modulation.

    Main Results:

    • Successful realization of parallel phase steps using CGHs.
    • Demonstrated feasibility of object distance evaluation through the interference function.
    • Eliminated the need for phase modulation in the reference path.

    Conclusions:

    • Computer-generated holograms offer an effective solution for parallel phase steps.
    • The proposed method simplifies interferometric measurements for object distance determination.
    • This technique enhances efficiency by avoiding reference path phase modulation.