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    This study introduces a method to calculate illuminance and caustic points for variable-index lenses. The procedure is effective for various lens types and ray paths, enhancing optical design capabilities.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering
    • Computational Optics

    Background:

    • Calculating illuminance and caustic points is crucial for optical system design.
    • Variable-index lenses offer advanced optical control but pose computational challenges.
    • Existing methods may not cover all ray types or complex lens geometries.

    Purpose of the Study:

    • To develop a comprehensive method for calculating illuminance and caustic points.
    • To address the specific challenges posed by radial-dependent variable-index lenses.
    • To ensure the method's applicability to diverse optical surfaces and ray types.

    Main Methods:

    • Evaluation of all necessary terms for illuminance and caustic point calculation.
    • Application to radial-dependent variable-index singlets.
    • Extension to aspheric surfaces and multiple lens systems.

    Main Results:

    • A complete procedure for calculating illuminance and caustic points along a ray path.
    • The method is valid for both meridional and skew rays.
    • Demonstrated applicability to complex optical designs including aspheric surfaces.

    Conclusions:

    • The developed procedure accurately calculates illuminance and caustic points for variable-index lenses.
    • The method provides a versatile tool for optical designers.
    • It supports the design of advanced optical systems with improved performance.