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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Orbital angular momentum (OAM) is a fundamental property of light.
    • Precise control over OAM spectrum is crucial for advanced optical applications.

    Purpose of the Study:

    • To demonstrate the generation of prescribed optical OAM spectrums.
    • To explore methods for controlling OAM spectrum symmetry and characteristics.

    Main Methods:

    • Utilized spiral complex field modulation for OAM spectrum generation.
    • Employed a vector beam generator and a hybrid conformal mapper for measurement.
    • Investigated three modulation techniques: pure spiral phase, spiral amplitude and phase, and spiral phase and polarization.

    Main Results:

    • Successfully generated both symmetric and asymmetric OAM spectrums.
    • Demonstrated the effectiveness of spiral complex field modulation in controlling OAM.
    • Validated the measurement capabilities of the hybrid conformal mapper.

    Conclusions:

    • Spiral complex field modulation provides a versatile method for generating tailored OAM spectrums.
    • The demonstrated techniques offer precise control over OAM properties.
    • Potential applications include optical trapping and high-speed optical communication systems.