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Reflective Schmidt-Cassegrain system for large-aperture telescopes.

M N Brychikhin, N I Chkhalo, Ya O Eikhorn

    Applied Optics
    |July 14, 2016
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    Summary

    A new reflective optical system was developed for ultraviolet and soft x-ray imaging. This modified Schmidt-Cassegrain design offers a wide field of view and corrects aberrations for enhanced hyperspectral instrument performance.

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    Area of Science:

    • Optics
    • Astronomy
    • Instrumentation

    Background:

    • The Schmidt-Cassegrain system is a widely used catadioptric telescope.
    • Limitations exist in its field of view and aberration correction for certain applications.

    Purpose of the Study:

    • To develop and test a modified reflective optical system.
    • To evaluate its suitability for ultraviolet (UV) and soft x-ray applications.
    • To enhance performance for hyperspectral instruments.

    Main Methods:

    • A reflective modification of the Schmidt-Cassegrain system was designed and constructed.
    • The system incorporates a planoid mirror with an aspheric profile and spherical primary/secondary mirrors.
    • Performance was evaluated based on key optical parameters.

    Main Results:

    • The system compensates for spherical aberration and astigmatism over a wide field of view (±1.5°).
    • Achieved angular resolution is better than 3 arcseconds.
    • Features a flat image field (30.4 mm diameter) and no chromatic aberrations.
    • Demonstrated suitability for UV and soft x-ray ranges.

    Conclusions:

    • The modified optical system is highly effective for UV and soft x-ray applications.
    • Its wide field of view and aberration correction make it ideal for hyperspectral imaging.
    • The design expands the operating range for advanced optical instruments.