研究目的
Investigating the effect of electric field on the ablation rate during the nanosecond pulsed laser ablation of aluminum and copper in deionized water.
研究成果
The application of an external electric field during pulsed laser ablation in liquids significantly increases the material removal rate and nanoparticle production efficiency. The direction of the electric field relative to the laser beam path affects the crater geometry and ablation rate, with parallel schemes yielding higher ablation rates.
研究不足
The study focuses on the effect of electric field on ablation rate and nanoparticle production efficiency but does not extensively analyze the characteristics of the produced nanoparticles. The differences in liquid volume between parallel and perpendicular schemes may affect the results.
1：Experimental Design and Method Selection
The study involved nanosecond pulsed laser ablation of aluminum and copper in deionized water under the influence of an external electric field, both parallel and perpendicular to the laser beam path. The ablation rate was estimated by measuring the dimensions of craters on the target.
2：Sample Selection and Data Sources
Aluminum (Aluminum 1100) and copper plates with 99.5% purity were used as targets. The laser beam was provided by a Q-switched Nd:YAG laser (1064 nm, ~10 ns, 10 Hz, ~50 J/cm2).
3：List of Experimental Equipment and Materials
Q-switched Nd:YAG laser, doublet lens with focal length of 180 mm, energy meter (EPM 1000, Coherent), optical microscope (LEICA DMR), UV–Visible absorption spectrometer (UV–Vis, Rayleigh UV 2100).
4：Experimental Procedures and Operational Workflow
The laser beam was focused at the target surface. The ablation was performed in deionized water with the liquid surface level about 1 cm above the target. Different electric potentials were applied in both parallel and perpendicular schemes to the laser beam path.
5：Data Analysis Methods
The crater volume was estimated by assuming a cone shape for the crater. The depth and diameter of craters were measured using an optical microscope and image processing software (ImageJ). UV–Vis absorption spectroscopy was used to analyze the optical properties of colloidal nanoparticles.
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