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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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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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Related Experiment Video

Updated: May 5, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Lateral-shearing, delay-dithering Mach-Zehnder interferometer for spatial coherence measurement.

Anatoly Efimov

    Optics Letters
    |December 11, 2013
    PubMed
    Summary

    A novel Mach-Zehnder interferometer measures spatial coherence in multimode fibers. This technique accurately calculates the degree of coherence for inhomogeneous optical sources, enhancing fiber optic characterization.

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    Area of Science:

    • Optics and Photonics
    • Optical Metrology

    Background:

    • Characterizing spatial coherence is crucial for understanding light propagation in optical systems.
    • Inhomogeneous optical sources, like multimode fibers (MMFs), present challenges for traditional coherence measurement techniques.

    Purpose of the Study:

    • To introduce a new image-shearing interferometer based on the Mach-Zehnder design for measuring spatial coherence.
    • To enable accurate coherence measurements at the output of inhomogeneous optical sources, specifically MMFs.

    Main Methods:

    • Utilized a Mach-Zehnder interferometer incorporating corner cubes.
    • Employed optical delay modulation in one arm to generate dynamic interference fringes.
    • Simultaneously measured fringe visibility and individual intensities for direct coherence modulus calculation.

    Main Results:

    • Successfully calculated the modulus of the complex degree of coherence as a function of lateral shear.
    • Measured the spatial degree of coherence for a step-index MMF.
    • Evaluated performance with both monochromatic and broadband optical sources.

    Conclusions:

    • The developed interferometer is effective for measuring spatial coherence in MMFs.
    • The technique provides a direct method for quantifying coherence properties of inhomogeneous optical sources.
    • This advancement aids in the characterization and optimization of optical fiber systems.