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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Freeform Optics

    Background:

    • Traditional imaging spectrometer designs face limitations in compactness and performance.
    • Freeform optics offer potential for improved system miniaturization and aberration correction.

    Purpose of the Study:

    • To present a novel design methodology for freeform imaging spectrometers.
    • To enable simultaneous optimization of refractive, reflective, and diffractive optical elements.
    • To facilitate the design of compact, high-performance spectrometers.

    Main Methods:

    • A point-by-point generation of all freeform surfaces, including the grating.
    • Simultaneous consideration of rays from multiple wavelengths, fields, and pupil coordinates.
    • Integration of refraction, reflection, and grating diffraction within the design process.

    Main Results:

    • Successful design of a compact freeform reflective imaging spectrometer.
    • Operation across the visible and near-infrared spectrum.
    • Achieved high performance with minimal optical distortion.

    Conclusions:

    • The proposed point-by-point design method is effective for creating advanced freeform imaging spectrometers.
    • This approach allows for the design of compact and high-performance systems.
    • The method serves as an excellent starting point for further optimization of non-symmetric configurations.