研究目的
Investigating the dynamics of splitting of the laser-induced plasma plume by spatiotemporal plasma imaging and spectroscopy.
研究成果
The study concludes that the laser-induced plasma plume splits into fast and slow components at reduced ambient pressures, with the brightest emission region moving from the slow to the fast component over time. A charge separation field is proposed to explain this phenomenon. The findings are significant for applications in laser-induced breakdown spectroscopy, pulsed laser deposition, and nanoscale synthesis.
研究不足
The study is limited to a copper target and specific pressure and laser energy ranges. The mechanism of plasma plume splitting is complex and not conclusively understood, indicating potential areas for further research.
1：Experimental Design and Method Selection:
The study employs spatiotemporal plasma imaging and spectrometry to investigate the laser-induced plasma plume splitting phenomenon. A Q-switched Nd:YAG laser is used to ablate a polished copper target in a vacuum chamber at varying pressures and laser energies.
2：Sample Selection and Data Sources:
A polished copper target is used, with the ablation area being ～ 10 ? 3 cm 2. The plasma emission is captured and analyzed.
3：The plasma emission is captured and analyzed.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A Q-switched Nd:YAG laser (Brilliant Eazy, Quantel, France), a vacuum chamber, a mechanical pump, a molecular turbo pump, a hot ion combi vacuum gauge, a three-dimension stepping motor, an intensified CCD (ICCD) camera (DH 734, Andor, UK), a spectrometer (ACTON SP2500, Princeton Instrument, USA), and a delay generator (DG 645, SRS, USA).
4：Experimental Procedures and Operational Workflow:
The laser beam is guided into the vacuum chamber to ablate the copper target. Plasma images and spectra are captured at different delay times and pressures. The fiber is moved to record plasma spectrum at different points.
5：Data Analysis Methods:
The intensity and speed of the two split plasma components are quantitatively analyzed. The compositions of these components are investigated using spatially-resolved spectral measurements.
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