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    Area of Science:

    • Optical Engineering
    • Astronomy
    • Telescope Technology

    Background:

    • Diffraction-limited angular resolution is a key performance metric for telescopes.
    • Improving resolution often involves complex and costly optical modifications.
    • Maintaining image quality alongside enhanced resolution is a significant challenge.

    Purpose of the Study:

    • To introduce a cost-effective optical setup for improving telescope angular resolution.
    • To analyze the resolution gain and Strehl ratio of the proposed system.
    • To validate the system's performance through experimental measurements.

    Main Methods:

    • Implementation of a simple optical system comprising an axicon and a convex lens within the telescope's optical path.
    • Analytical calculations for predicting angular resolution improvement and Strehl ratio.
    • Experimental validation using the developed optical setup to measure image resolution and Strehl ratio.

    Main Results:

    • The optical system demonstrated a potential angular resolution increase of up to 38%.
    • Experimental results showed a 30% improvement in single-acquisition image resolution.
    • The measured Strehl ratio was 0.07, aligning with analytical predictions.
    • Ultrashallow axicons allow for significant Strehl ratio increases, potentially exceeding unity.

    Conclusions:

    • The proposed optical setup offers a practical and affordable method to enhance telescope angular resolution.
    • The system achieves substantial resolution gains with minimal compromise to image quality.
    • This technology facilitates higher-resolution astronomical measurements with reduced experimental complexity.