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    Freeform optics enable continuous zoom afocal systems with enhanced imaging flexibility. This study demonstrates their potential in unobscured reflective systems, achieving diffraction-limited performance.

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    Area of Science:

    • Optical Engineering
    • Imaging Systems
    • Freeform Optics

    Background:

    • Continuous zoom afocal systems provide significant flexibility in various imaging applications.
    • Traditional systems face limitations in aberration correction during zoom motion.

    Purpose of the Study:

    • To investigate the potential of freeform optics in continuous zoom reflective systems.
    • To design and optimize a four-mirror unobscured afocal system with zoom capabilities.

    Main Methods:

    • Designed a four-mirror unobscured afocal system with zoom capabilities (2X and 3X ratios).
    • Utilized freeform profiles on each mirror for aberration correction.
    • Optimized for minimum volume package and diffraction-limited performance.

    Main Results:

    • Achieved diffraction-limited performance with <5% RMS pupil shape and offset errors for both zoom ratios.
    • Freeform design demonstrated 3x better RMS wavefront error compared to off-axis conic designs.
    • Exhibited 3.5x better exit pupil quality in the freeform design.

    Conclusions:

    • Freeform optics are highly capable for advanced continuous zoom reflective systems.
    • The designed system offers superior aberration correction and image quality.
    • Freeform optics present a promising solution for compact, high-performance imaging systems.