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Related Concept Videos

Voltage Doubler Circuit01:23

Voltage Doubler Circuit

635
A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
635
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
113

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Updated: Jul 15, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Inhibiting zero-order light of a spatial light modulator with voltage optimization.

Yueqiang Zhu, Kaige Wang, Jintao Bai

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    |September 29, 2023
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    Summary

    Researchers significantly reduced zero-order light from spatial light modulators (SLMs) by adjusting pixel voltages. This method enhances modulation efficiency and is crucial for high numerical aperture optical systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Pixelation in spatial light modulators (SLMs) causes problematic zero-order light, especially in high numerical aperture (NA) optical systems.
    • This artifact degrades optical performance and limits applications requiring precise light control.

    Purpose of the Study:

    • To investigate a method for significantly reducing or eliminating zero-order light from SLMs.
    • To improve the modulation efficiency of SLMs.

    Main Methods:

    • Adjusting high-level and low-level pixel voltages of the SLM.
    • Validating the method using an inverted fluorescence microscope setup.

    Main Results:

    • Achieved up to 91.3% inhibition of zero-order light.
    • Improved modulation efficiency from 77.5% to 92.6%.

    Conclusions:

    • Proper adjustment of SLM pixel voltages effectively suppresses zero-order light.
    • The developed technique enhances SLM performance, particularly for high-NA applications.