研究目的
To study the influence of electric fields of different strength (from 0 to 106 V/m–1) on the spatial and temporal evolution of the laser plasma arising under the action of millisecond laser pulses at the surface of metals (copper, aluminum, lead) and on the mechanisms of formation of the surface relief of the irradiated samples.
研究成果
The characteristic size of metal droplets ejected during laser processing decreases with increasing external electric field strength, independent of polarity. This effect is attributed to changes in gravity-capillary wave wavelength on the molten metal surface, offering potential for controlling droplet size in laser deposition processes.
研究不足
The study is limited to metals (Cu, Al, Pb) and specific laser and electric field parameters. The effect of higher electric field strengths or different metals was not explored.
1：Experimental Design and Method Selection:
The study used a GOR-100M ruby laser for laser processing of metals in an external electric field. High-speed holographic filming was employed to observe the plasma torch evolution.
2：Sample Selection and Data Sources:
Metals (Cu, Al, Pb) were irradiated under varying electric field strengths.
3：List of Experimental Equipment and Materials:
GOR-100M ruby laser, IMO-2N energy meter, FEK-14 coaxial photodetector, S8-13 oscilloscope, Mach-Zehnder interferometer, SFR-1M high-speed recording camera.
4：Experimental Procedures and Operational Workflow:
Laser pulses were directed onto metal samples in an electric field, with plasma evolution recorded via holographic methods.
5：Data Analysis Methods:
Interferograms were processed to determine electron concentration in the plasma and droplet size distribution.
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