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Updated: May 24, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Fraunhofer-type absorption lines in double-pulse laser-induced plasma
Lev Nagli1, Michael Gaft, Igor Gornushkin
1Laser Distance Spectrometry, 11 Granit Street, Petach Tikva 49514, Israel. nagli@post.tau.ac.il
Researchers studied laser-induced plasma, finding a solar-like structure with a hot core and cooler shell. This phenomenon creates absorption lines, enabling new direct and calibration-free laser-induced breakdown spectroscopy applications.
Area of Science:
- Plasma Physics
- Spectroscopy
Background:
- Understanding the early stages of laser-induced plasma (LIP) is crucial for advanced analytical techniques.
- Previous studies have not fully characterized the initial plasma dynamics and spectral features.
Purpose of the Study:
- To investigate the initial spatial and spectral characteristics of confocal double-pulse laser-induced plasma.
- To explore the potential of observed spectral features for analytical spectroscopy.
Main Methods:
- Utilizing a confocal double-pulse laser system to generate laser-induced plasma.
- Analyzing the plasma's temporal evolution and spectral output within the first microseconds.
Main Results:
- Observed a distinct solar-like plasma configuration with a hot core and cooler outer shell within 20 ns of the second pulse.
- Identified absorption lines in the plasma spectrum, analogous to Fraunhofer lines in the solar spectrum, caused by light absorption in the cooler shell.
- Demonstrated the feasibility of using these absorption lines for direct and calibration-free laser-induced breakdown spectroscopy (LIBS).
Conclusions:
- The early dynamics of double-pulse laser-induced plasma create unique spectral signatures.
- These spectral features offer a promising avenue for developing advanced, calibration-free analytical methods in laser-induced breakdown spectroscopy.
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