Time-Dependent Intensity Ratio-Based Approach for Estimating the Temperature of Laser Produced Plasma

Area of Science:

• Plasma Physics
• Spectroscopy
• Laser-Induced Breakdown Spectroscopy (LIBS)

Background:

• Accurate plasma temperature measurement is crucial for understanding plasma properties and dynamics.
• Traditional methods like Boltzmann/Saha-Boltzmann plots often require multiple emission lines, which may not always be available or free from self-absorption.
• Limitations in line availability and self-absorption effects hinder precise plasma temperature determination.

Purpose of the Study:

• To develop a rapid and simplified approach for modeling the temporal evolution of plasma temperature.
• To introduce a method requiring only two emission lines for accurate plasma temperature estimation.
• To overcome the limitations of multi-line spectroscopic techniques in plasma diagnostics.

Main Methods:

• Generated plasma using a brass target with a single-pulse nanosecond laser (7 ns pulse duration, 532 nm excitation wavelength).
• Employed a novel intensity ratio model utilizing only two emission lines to estimate plasma temperature and radiation decay constant.
• Validated the method by comparing results obtained from various emission line combinations with established techniques.

Main Results:

• The proposed two-line method provides a simple, accurate, and fast estimation of plasma temperature.
• Demonstrated excellent agreement between the results from the new method and previously reported values.
• The technique significantly broadens the applicability of plasma temperature measurements.

Conclusions:

• The developed two-line intensity ratio model offers a practical and efficient alternative for plasma temperature determination.
• This simplified approach enhances the accessibility and reliability of plasma diagnostics.
• The method is particularly valuable in scenarios where multiple emission lines are unavailable or compromised by self-absorption.