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← ScienceDuring micromachining with a pulsed laser, which outcome results when exceeding plasma shielding thresholds?
A)Energy coupling efficiency severely decreases✓
B)Material ablation rate consistently increases
C)Sub-surface thermal diffusion becomes negligible
D)Surface roughness exhibits significant decrease
💡 Explanation
Excessive laser power causes ionization; plasma shielding occurs because the generated plasma reflects and absorbs laser energy, therefore limiting its ablative effectiveness, rather than enhancing it or affecting diffusion processes.
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