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Design method for large zoom ratio freeform reflective zoom systems based on initial configuration optimization using

Yunsheng Qi, Qingyu Meng, Jiangnan Wang

    Optics Express
    |August 13, 2025
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    Summary
    This summary is machine-generated.

    This study introduces a novel design method for reflective zoom optical systems, overcoming challenges to achieve large zoom ratios. The approach optimizes initial configurations for enhanced imaging quality in complex optical designs.

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    Area of Science:

    • Optical Engineering
    • Optics and Photonics

    Background:

    • Reflective zoom optical systems offer lightweight and achromatic advantages for demanding environments.
    • Achieving large zoom ratios in these systems is challenging due to design constraints and physical limitations.

    Purpose of the Study:

    • To propose a novel design methodology for large zoom ratio off-axis reflective zoom optical systems.
    • To address the limitations hindering large zoom ratios in current reflective zoom designs.

    Main Methods:

    • Derivation of zoom equations and aberration characteristics for mechanically compensated reflective zoom systems.
    • Construction of a global merit function (G) integrating zoom ratio and imaging quality.
    • Application of a global optimization algorithm to find optimal initial configurations.
    • Refinement of initial configurations using freeform surfaces and complex optical geometries.

    Main Results:

    • Successful realization of a large zoom ratio off-axis three-mirror reflective zoom optical system.
    • Demonstration of a design method capable of achieving high zoom ratios while maintaining imaging quality.

    Conclusions:

    • The proposed design method provides a novel approach for developing reflective zoom optical systems with significantly large zoom ratios.
    • The method effectively overcomes traditional constraints, enabling advanced optical system designs.