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Deterministic method for generating removal functions through online beam density regulation.

Hongyu Zou, Hao Hu, Xiaoqiang Peng

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    This summary is machine-generated.

    This study introduces a new method for ion beam figuring (IBF) to precisely control optical element manufacturing. It uses online regulation of ion beam density for dynamic removal function generation, improving accuracy and flexibility.

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    Area of Science:

    • Optical Engineering
    • Materials Science
    • Manufacturing Technology

    Background:

    • Ion beam figuring (IBF) is crucial for ultra-high-precision optical manufacturing, enabling atomic-level material removal.
    • Current IBF methods face challenges with parameter drift and inflexibility in removal function generation, hindering dynamic error correction across frequency bands.

    Purpose of the Study:

    • To develop a deterministic method for generating removal functions in IBF through online regulation of ion beam density.
    • To enhance the adaptability and precision of IBF for full-band error control in optical element figuring.

    Main Methods:

    • Analyzed the influence of stand-off distance and aperture on ion beam density.
    • Developed a multi-task learning prediction model for removal function parameters and beam current distribution.
    • Implemented online regulation of ion beam density for dynamic removal function generation.

    Main Results:

    • Experimental validation confirmed that stand-off distance and aperture adjustments effectively regulate beam density.
    • The multi-task learning model achieved a determination coefficient (R²) > 0.9716 and mean squared error (MSE) < 0.0079.
    • The generated removal function accuracy exceeded 96% compared to the target removal function, meeting precision requirements.

    Conclusions:

    • The proposed deterministic method overcomes limitations of traditional fixed-parameter removal functions in IBF.
    • The dynamic parameter adjustment capability supports advanced strategies like variable beam diameter modification for optical manufacturing.
    • This approach offers a novel solution for precise full-band error correction in ultra-high-precision optical elements.