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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...

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Updated: Jun 19, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Programmable diffractive optical element using a multichannel lanthanum-modified lead zirconate titanate phase

J A Thomas, Y Fainman

    Optics Letters
    |October 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed a programmable diffractive optical element using an electro-optic phased array. This device enables efficient, high-speed optical beam steering with precise control over a wide range.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Traditional optical beam steering methods often face limitations in speed, resolution, and programmability.
    • Electro-optic materials offer potential for dynamic control of optical properties.

    Purpose of the Study:

    • To introduce and demonstrate a novel programmable diffractive optical element (PDOE).
    • To showcase the capabilities of an electro-optic phased array for optical beam steering.

    Main Methods:

    • Design and fabrication of a PDOE using a multichannel lanthanum-modified lead zirconate titanate (LMPZ) phase modulator.
    • Experimental validation of a 16-channel device with a 2π voltage of 300 V.

    Main Results:

    • Demonstrated selective and continuous optical beam steering.
    • Achieved efficient, high-speed, and high-resolution random-access beam steering.
    • Validated the performance of the LMPZ-based electro-optic phased array.

    Conclusions:

    • The developed PDOE offers a versatile platform for advanced optical beam control.
    • This technology paves the way for next-generation optical systems requiring dynamic beam manipulation.