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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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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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Published on: March 20, 2017

Multimode fiber interferometry with and without phase conjugation.

P R Forman, F C Jahoda, B L Mason

    Applied Optics
    |August 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Multimode fiber interferometers can maintain fringe contrast using phase conjugation. However, shared conjugating crystals can cause crosstalk between fibers, a phenomenon modeled in this study.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Interferometry

    Background:

    • Single-mode fibers are typically assumed for fiber interferometers.
    • Multimode fibers offer potential advantages but face challenges with mode scrambling.
    • Phase conjugation presents an alternative method for maintaining fringe contrast.

    Purpose of the Study:

    • To investigate the use of phase conjugation mirrors in multimode fiber interferometers.
    • To analyze the crosstalk phenomenon when multiple interferometers share a phase conjugating crystal.
    • To evaluate the performance of multimode fibers in conventional interferometer configurations.

    Main Methods:

    • Employing phase conjugation mirrors in multimode fiber interferometer arms.
    • Utilizing a self-conjugating Barium Titanate (BaTiO3) crystal shared among multiple interferometers.
    • Conducting control experiments with conventional Mach-Zehnder interferometers using graded and step-index multimode fibers.

    Main Results:

    • Phase conjugation successfully reversed spatial scrambling, maintaining good fringe contrast in multimode fiber interferometers.
    • Significant crosstalk was observed between fibers sharing a common BaTiO3 conjugating crystal, dependent on spatial configuration.
    • Conventional Mach-Zehnder configurations yielded usable data with multimode fibers, even with reduced fringe contrast.

    Conclusions:

    • Phase conjugation is a viable technique for multimode fiber interferometry, but shared crystal configurations require careful design to mitigate crosstalk.
    • A model was developed to explain the observed crosstalk in shared phase conjugating systems.
    • Multimode fibers can be effectively used in interferometric applications, even in standard setups, provided contrast limitations are managed.