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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...
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...
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Sandwich, double-reference-wave, holographic, phase-shift interferometry.

J D Trolinger, N J Brock

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

    A novel holographic method enables phase-shift interferometry with pulsed holographic techniques. This approach overcomes limitations, allowing accurate phase map generation from interferograms for advanced optical measurements.

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    Area of Science:

    • Optical Engineering
    • Holography
    • Interferometry

    Background:

    • Phase-shift interferometry (PSI) is a standard technique for converting interferograms to phase maps.
    • Powerful pulsed holographic interferometry techniques are often incompatible with PSI.
    • Existing solutions for combining PSI and pulsed holography face practical challenges.

    Purpose of the Study:

    • To develop a method compatible with pulsed holographic interferometry.
    • To enable phase-shift interferometry for pulsed holographic techniques.
    • To overcome limitations of current PSI integration methods.

    Main Methods:

    • A novel technique using a second hologram sandwiched with the first hologram.
    • Generating two reference waves during reconstruction from the double-hologram setup.
    • Employing phase stepping during reconstruction.

    Main Results:

    • The presented method successfully produces the required two reference waves for PSI.
    • The technique compensates for chromatic and geometric aberrations.
    • Enables the use of PSI with pulsed holographic interferometry.

    Conclusions:

    • A simple and effective method for integrating PSI with pulsed holography is presented.
    • The double-hologram approach overcomes practical limitations of prior methods.
    • This technique expands the applicability of phase-shift interferometry in advanced optical metrology.