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Updated: May 26, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Evolution of the plasma bubble in a narrow gap.
1Department of Physics, National Chung Cheng University, ChiaYi 62102, Taiwan.
Plasma bubble evolution in narrow gaps shows three distinct phases: spherical fluctuating, radial fingering, and dense branching. Reduced surface tension from local heating likely drives these patterns.
Area of Science:
- Plasma Physics
- Fluid Dynamics
Background:
- Plasma bubbles are complex structures observed in various physical systems.
- Understanding their evolution is crucial for controlling plasma behavior.
Purpose of the Study:
- To investigate the morphological evolution of plasma bubbles in a narrow gap.
- To identify distinct phases of plasma bubble development.
- To explore the relationship between plasma heating and bubble morphology.
Main Methods:
- Experimental observation of plasma bubble evolution in a narrow gap.
- Morphological analysis of plasma bubble structures.
- Measurement of fingering boundary wavelengths.
- Fractal dimension analysis of dense branching plasma bubbles.
Main Results:
- Identified three evolutionary phases: spherical fluctuating, radial fingering, and dense branching.
- Observed similarities between plasma bubble evolution and Hele-Shaw cell patterns.
- Experimentally analyzed the wavelength dependence of the fingering boundary.
- Determined a fractal dimension of 1.74 for dense branching plasma bubbles.
Conclusions:
- Plasma bubble evolution in narrow gaps exhibits distinct, phase-like transitions.
- Reduced surface tension due to localized heating from filamentary discharges is a probable cause for radial fingering and dense branching.
- The findings provide insights into the dynamics of pattern formation in plasma systems.
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