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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...

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Related Experiment Video

Updated: Jun 23, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Dual-wavelength operation diffractive phase elements for pattern formation.

I Barton, P Blair, M R Taghizadeh

    Optics Express
    |April 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers designed novel diffractive phase elements capable of creating unique far-field intensity patterns using two specific wavelengths. These elements utilize deep surface-relief structures and an iterative Fourier transform algorithm for high diffraction efficiency.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    Last Updated: Jun 23, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

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    Published on: January 28, 2019

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
    12:14

    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

    Published on: August 12, 2013

    Area of Science:

    • Optics and Photonics
    • Diffractive Optics
    • Nanophotonics

    Background:

    • Diffractive phase elements (DPEs) are crucial for manipulating light wavefronts.
    • Achieving dual-wavelength operation with high efficiency in DPEs presents significant design challenges.

    Purpose of the Study:

    • To design and fabricate novel diffractive phase elements for reconstructing distinct far-field intensity patterns at two specific wavelengths.
    • To demonstrate high diffraction efficiency for dual-wavelength operation.

    Main Methods:

    • Utilized deep surface-relief structures exceeding 2π radians phase delay.
    • Employed a modified iterative Fourier transform algorithm for element design.
    • Fabricated a 16 phase-level element for dual-wavelength operation.

    Main Results:

    • Successfully designed and fabricated DPEs capable of dual-wavelength reconstruction of distinct intensity patterns.
    • Demonstrated high diffraction efficiency for the fabricated 16 phase-level element operating at blue and red wavelengths.

    Conclusions:

    • The developed design methodology enables the creation of efficient dual-wavelength diffractive phase elements.
    • The experimental demonstration validates the potential of these elements for advanced optical applications.