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Updated: Jun 22, 2025

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Near 2π solid angle fluorescence collection for laser-induced breakdown spectroscopy.

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    This summary is machine-generated.

    A new fluorescence collection method using a parabolic mirror and lens significantly enhances detection limits for heavy metals and radioactive elements. This technique improves signal collection by over 2.5 times, boosting environmental and human safety monitoring.

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    Area of Science:

    • Analytical Chemistry
    • Optical Physics

    Background:

    • Detecting heavy metals and radioactive elements is vital for environmental and human safety.
    • Laser-induced breakdown spectroscopy (LIBS) uses lenses to collect plasma fluorescence, but collection efficiency is limited by numerical aperture (NA).

    Purpose of the Study:

    • To develop a novel fluorescence collection scheme to improve the detection limits of heavy metal and radioactive elements.
    • To enhance the efficiency of plasma fluorescence collection in laser-induced breakdown spectroscopy.

    Main Methods:

    • Proposed a novel fluorescence collection scheme combining a parabolic mirror and a lens.
    • Simulated the fluorescence collection solid angle for opaque (∼1.4π) and transparent (∼1.9π) materials.
    • Experimentally validated the enhancement in fluorescence collection ability and signal-to-noise ratio for opaque samples.

    Main Results:

    • The proposed scheme collects fluorescence in a solid angle of ∼1.4π for opaque and ∼1.9π for transparent materials.
    • Simulations indicated a 3.8-fold improvement for opaque and 4.5-fold for transparent samples compared to a single lens (NA=0.5).
    • Experimental results demonstrated a 2.8-fold enhancement in fluorescence collection and a 2.5-fold increase in signal-to-noise ratio for opaque samples.

    Conclusions:

    • The novel parabolic mirror and lens scheme significantly enhances plasma fluorescence collection efficiency in LIBS.
    • This improved collection method offers a substantial advancement for detecting hazardous elements, improving environmental and human safety.
    • The technique shows promise for more sensitive and reliable elemental analysis in various applications.