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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...
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Controlling an optical vortex array from a vortex phase plate, mode converter, and spatial light modulator.

T D Huang, T H Lu

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    |August 16, 2019
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    Summary
    This summary is machine-generated.

    Researchers developed a simple optical system to generate controllable optical vortex (OV) arrays. This method allows precise control over the size and quantity of optical vortices using Hermite-Gaussian modes.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Optical vortices (OVs) are beams with helical phase fronts, crucial for applications in optical manipulation and communication.
    • Generating controllable OV arrays with tailored properties remains a challenge.

    Purpose of the Study:

    • To propose and demonstrate a convenient method for generating optical vortex arrays with controllable size and quantity.
    • To explore the superposition of Hermite-Gaussian (HG) modes for creating diverse OV array structures.

    Main Methods:

    • Utilized a simple optical system incorporating vortex phase plates, a mode converter, and a spatial light modulator.
    • Generated OV arrays through the superposition of crossed Hermite-Gaussian (HG) modes with controlled orders and polarizations.

    Main Results:

    • Successfully generated optical vortex arrays with controllable sizes and quantities.
    • Experimentally and theoretically demonstrated vector superposed optical fields with defined OV array characteristics.
    • Showcased the ability to define OV array dimensions and counts using specific HG mode bases.

    Conclusions:

    • The proposed simple optical setup offers an effective means for generating and controlling optical vortices and their arrays.
    • This method provides a flexible platform for tailoring OV array properties for various applications.