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Related Concept Videos

Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Updated: Jun 9, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Published on: February 27, 2019

Liquid-crystal phase modulator for unpolarized light.

G D Love

    Applied Optics
    |September 8, 2010
    PubMed
    Summary

    A novel method uses a double pass through a liquid crystal retarder to phase modulate unpolarized light. This technique offers a straightforward approach for optical phase control applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Phase modulation is crucial for various optical applications.
    • Controlling the phase of unpolarized light presents unique challenges.

    Purpose of the Study:

    • To present a simple method for phase modulating unpolarized light.
    • To utilize a nematic liquid crystal retarder for this purpose.

    Main Methods:

    • A double pass configuration was employed.
    • A nematic liquid crystal retarder was used as the active element.

    Main Results:

    • The method successfully achieved phase modulation.
    • The technique is applicable to unpolarized light.

    Conclusions:

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    • A simple and effective method for phase modulating unpolarized light has been demonstrated.
    • This technique has potential applications in optical systems requiring phase control.