Optimization of copper detection based on polarization-resolved laser-induced breakdown spectroscopy.

Area of Science:

• Plasma Physics
• Spectroscopy
• Materials Science

Background:

• Stable spectral data is crucial for accurate elemental analysis.
• Traditional laser-induced breakdown spectroscopy (LIBS) can suffer from signal instability.
• Understanding plasma polarization is key to improving LIBS performance.

Purpose of the Study:

• To develop a polarization-resolved laser-induced breakdown spectroscopy (PRLIBS) platform for stable copper plasma spectral data acquisition.
• To investigate the relationship between plasma recombination anisotropy and spectral polarization.
• To establish a characteristic model for S-wave intensity in PRLIBS for enhanced elemental identification.

Main Methods:

• Construction of a polarization-resolved laser-induced breakdown spectroscopy (PRLIBS) detection platform.
• Integration of discrete and continuum plasma spectra for characteristic function development.
• Analysis of spatial polarized light information and derivation of the S-wave intensity characteristic model.

Main Results:

• PRLIBS successfully obtained stable spectral data and polarization information for copper plasma.
• Plasma recombination anisotropy under local thermal equilibrium was identified as the cause of radiation polarization.
• Spectral polarization decreased with increasing laser energy density, with continuum emission showing stronger polarization than discrete lines.
• The S-wave exhibited high activity, contributing to more stable characteristic peak signals.

Conclusions:

• PRLIBS offers a significant improvement over traditional LIBS by providing more stable spectral signals.
• The derived characteristic model aids in understanding plasma behavior and enhancing elemental identification.
• PRLIBS provides a scientific basis for the safe and non-destructive detection of heavy metals.