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    We developed a novel null interferometric microscope (NIM) for detecting surface defects on inertial confinement fusion (ICF) capsules. This technology improves ignition probability by enabling direct, large-field surface inspection of ICF capsules.

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    Area of Science:

    • Optics
    • Surface Metrology
    • Fusion Energy

    Background:

    • Surface defects on inertial confinement fusion (ICF) capsules critically reduce ignition probability.
    • Accurate and efficient detection of these defects is essential for advancing ICF research.

    Purpose of the Study:

    • To introduce the first null interferometric microscope (NIM) for direct, large-field surface defect detection on ICF capsules.
    • To demonstrate the NIM's capability to measure capsules of varying diameters.

    Main Methods:

    • Replaced the planar reference mirror in conventional interferometric microscopes with a spherical reference mirror to achieve full-field null interference.
    • Employed a short-coherence light source system to eliminate parasitic fringes.
    • Verified NIM feasibility using experimental capsules of 0.7 mm and 1 mm diameters.

    Main Results:

    • Successfully demonstrated null interference across the full field of view.
    • Verified the NIM's effectiveness in detecting surface defects on ICF capsules.
    • Confirmed the NIM's adaptability for measuring ICF capsules with different diameters.

    Conclusions:

    • The developed NIM provides a direct and large-field method for surface defect detection on ICF capsules.
    • This advancement is crucial for improving the reliability and success rate of ICF experiments.
    • The NIM's versatility in measuring capsules of different sizes makes it a valuable tool for ICF research.