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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.
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

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Related Experiment Video

Updated: Jun 19, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Phase-shifting point diffraction interferometer.

H Medecki, E Tejnil, K A Goldberg

    Optics Letters
    |November 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new interferometer design provides highly accurate wave-front aberration measurements across various wavelengths. This advanced point diffraction interferometer utilizes phase shifting for enhanced efficiency and precision, suitable for optical system testing.

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    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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    Implementation of a Reference Interferometer for Nanodetection
    16:11

    Implementation of a Reference Interferometer for Nanodetection

    Published on: April 26, 2014

    Area of Science:

    • Optical Metrology
    • Wavefront Sensing
    • Interferometry

    Background:

    • Accurate measurement of wave-front aberrations is critical for optical system performance.
    • Conventional point diffraction interferometers have limitations in efficiency and accuracy.
    • Testing optical systems at their operational wavelength (at-wavelength testing) is essential for advanced applications like lithography.

    Purpose of the Study:

    • To introduce a novel interferometer design for precise wave-front aberration measurement.
    • To enhance the capabilities of point diffraction interferometry for a broad spectral range (visible to X-ray).
    • To enable accurate at-wavelength testing of optical systems, particularly for short-wavelength projection lithography.

    Main Methods:

    • Development of a new interferometer design based on the point diffraction interferometer principle.
    • Incorporation of phase-shifting techniques to improve measurement accuracy and efficiency.
    • Construction and operation of a visible-light prototype to demonstrate the design's feasibility.

    Main Results:

    • The novel interferometer design achieves high accuracy in measuring wave-front aberrations.
    • The design demonstrates suitability for a wide range of wavelengths, from visible light to X-rays.
    • Phase shifting significantly enhances the efficiency and accuracy compared to conventional methods.

    Conclusions:

    • The developed interferometer offers a significant advancement for precise optical metrology.
    • Its capabilities make it ideal for at-wavelength testing of demanding optical systems.
    • The design holds particular promise for the characterization of optics used in advanced lithography.