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← ScienceWith a high-power pulsed laser drilling through steel, which outcome reduces cutting efficiency at high pulse repetition rates?
A)Plasma shielding reduces material ablation✓
B)Thermal lensing defocuses the beam
C)Optical saturation limits photon absorption
D)Stimulated scattering reduces beam energy
💡 Explanation
High repetition rates can cause plasma shielding because the ablated material ionizes and absorbs the laser energy, reducing ablation, therefore efficiency drops rather than thermal lensing or stimulated scattering which are less prominent in pulsed laser ablation.
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