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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

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.
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...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Related Experiment Video

Updated: Jun 12, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Holographic real-time three-slit interferometer.

D Wang, T G Chen

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

    A novel three-slit interferometer system enables sensitive scanning measurements of optical path length differences. This advanced holographic technique overcomes previous limitations for diverse material analysis applications.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Holography

    Background:

    • Traditional optical path length measurement systems often have strict positional constraints.
    • Accurate measurement of optical path differences is crucial for material characterization and quality control.

    Purpose of the Study:

    • To introduce a new, highly sensitive scanning system for measuring optical path length differences over large objects.
    • To overcome the limitations of previous systems by employing a holographic approach.

    Main Methods:

    • A three-slit interferometer system is utilized, incorporating a double-exposure hologram to separate lateral slits from the central slit.
    • Holographic reconstruction of lateral slit wavefronts is performed using an off-axis reference beam.
    • Live intensity distribution patterns are formed by combining reconstructed wavefronts with light from the central slit.

    Main Results:

    • The system allows for optical path length measurements by analyzing the magnitude of adjacent maxima as an object is translated.
    • The holographic separation of slits significantly reduces positional constraints compared to prior methods.

    Conclusions:

    • The described three-slit interferometer system offers a sensitive and versatile tool for optical path length difference measurements.
    • Practical applications include flatness testing of optical flats, thickness measurements of films, and determination of refractive-index differences.