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Analysis and calculation of the fill factor for microlens array scanning systems.

Zenghui Ge, Yunhan Huang, Zhiying Liu

    Applied Optics
    |February 24, 2022
    PubMed
    Summary

    Microlens array (MLA) scanning systems suffer reduced resolution due to excrescent light. A new fill factor metric accurately characterizes relative aperture and predicts MLA system performance.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering

    Background:

    • Microlens arrays (MLAs) are crucial for applications like laser radar and optical communications.
    • Increased scanning angles in MLA systems lead to overlapping beams, reducing relative aperture and system resolution.

    Purpose of the Study:

    • To introduce and analyze a fill factor for characterizing the relative aperture in MLA scanning systems.
    • To investigate the impact of the fill factor on the modulation transfer function (MTF) of MLA systems.

    Main Methods:

    • Utilized matrix optics paraxial ray tracing to calculate the fill factor based on system parameters.
    • Performed simulations of the MLA system to evaluate performance.
    • Compared simulated results with theoretical calculations.

    Main Results:

    • The fill factor effectively characterizes the relative aperture of MLA scanning systems.
    • The fill factor's influence on the modulation transfer function was successfully analyzed.
    • Simulated MLA system results closely matched theoretical calculations.

    Conclusions:

    • The proposed fill factor provides a valuable metric for assessing MLA system performance.
    • This research aids in the design and evaluation of microlens array scanning systems.
    • Understanding the fill factor is essential for optimizing MLA resolution and aperture utilization.