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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 7, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Interferometer for optical coupling and mode selection in a multichannel laser array.

Y A Rubinov

    Applied Optics
    |November 6, 2010
    PubMed
    Summary

    A novel Lummer-Gehrcke interferometer enhances laser array performance by enabling controlled power redistribution. This method reduces sidelobes and improves optical coupling efficiency for lasers and waveguides.

    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Multichannel lasers often suffer from sidelobe issues and inefficient optical coupling.
    • Existing methods for controlling laser array output can be complex and less efficient.

    Purpose of the Study:

    • To theoretically investigate the use of a Lummer-Gehrcke interferometer for optical coupling and mode selection in laser arrays.
    • To demonstrate a method for controlling laser power redistribution within the resonator.

    Main Methods:

    • Development of a Lummer-Gehrcke interferometer as a resonator reflector.
    • Theoretical analysis of mirror reflection control for power redistribution.
    • Modeling of far-field radiation profiles and optical coupling efficiency.

    Main Results:

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    Last Updated: Jun 7, 2026

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

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    Implementation of a Reference Interferometer for Nanodetection
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    Implementation of a Reference Interferometer for Nanodetection

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    • The proposed interferometer allows for controlled redistribution of laser power through outlet mirror channels.
    • It enables single-beam power extraction from the resonator.
    • Significant reduction in sidelobes of the far-field radiation profile was theoretically shown.
    • Enhanced efficiency in optical coupling of laser arrays with waveguides and fibers.

    Conclusions:

    • The Lummer-Gehrcke interferometer offers an effective solution for managing laser array output.
    • This technique improves beam quality and coupling efficiency for integrated photonic devices.
    • The method is also applicable to striped lasers for power redistribution.