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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: Jul 7, 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

Phase-aberration correction with dual liquid-crystal spatial light modulators.

T L Kelly, J Munch

    Applied Optics
    |February 21, 2008
    PubMed
    Summary

    This study presents a novel phase-aberration-correction system using liquid-crystal spatial light modulators. The system successfully corrects phase aberrations while minimizing amplitude variations for improved optical wave front control.

    Area of Science:

    • Optics and Photonics
    • Wavefront Engineering
    • Adaptive Optics

    Background:

    • Phase aberrations degrade optical system performance.
    • Spatial light modulators (SLMs) offer potential for wavefront correction.
    • Phase-amplitude coupling in SLMs presents a challenge for precise control.

    Purpose of the Study:

    • To develop and experimentally verify a phase-aberration-correction system.
    • To address the limitations of single-panel SLM correction, specifically amplitude variations.
    • To achieve high-fidelity wavefront correction with minimal amplitude modulation.

    Main Methods:

    • Utilized a Mach-Zehnder interferometer with high-resolution twisted nematic liquid-crystal spatial light modulators (SLMs).
    • Developed and applied a correction algorithm.

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  • Employed a dual-panel SLM architecture with a multiplicative optical system.

    • Main Results:

    • Successfully corrected phase aberrations using a single SLM panel.
    • Identified and quantified unacceptable amplitude variations due to phase-amplitude coupling.
    • Achieved effective phase aberration correction with less than 10% amplitude variation using a dual-panel system.

    Conclusions:

    • A dual-panel SLM system effectively corrects phase aberrations while mitigating amplitude modulation.
    • The developed system offers a viable solution for precise wavefront control in optical systems.
    • This approach enhances the utility of SLMs in applications requiring high-quality optical wavefronts.