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Related Concept Videos

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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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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Shear on the Horizontal Face of a Beam Element01:16

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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
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Related Experiment Video

Updated: Nov 24, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Spatial axial shearing common-path interferometer for natural light.

Masatoshi Imbe

    Applied Optics
    |December 28, 2020
    PubMed
    Summary

    A novel spatial axial shearing interferometer measures the longitudinal spatial coherence of natural light. This method allows for greater shear than temporal coherence limits, confirming theoretical predictions.

    Area of Science:

    • Optics and Photonics
    • Coherence Theory

    Background:

    • Measuring spatial coherence is crucial for understanding light propagation.
    • Existing interferometers may have limitations in achieving specific shear types.

    Purpose of the Study:

    • To propose and demonstrate a spatial axial shearing interferometer.
    • To measure the mutual coherence function representing longitudinal spatial coherence.

    Main Methods:

    • Utilizing a spatial light modulator to induce axial shear without radial shear.
    • Employing an interferometer with identical optical path lengths along the optical axis.

    Main Results:

    • Successfully generated a spatial axial shear exceeding the coherence length from temporal coherence.

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  • Obtained a mutual coherence function with spatial distribution consistent with coherence-diffraction relations.

    • Conclusions:

    • The proposed interferometer effectively measures longitudinal spatial coherence.
    • The experimental results validate the relationship between coherence and diffraction.