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Which effect increases in a pulsed laser ablation due to tightly focused beams?

A)Multiphoton ionization becomes more probable
B)Thermal diffusion dominates energy distribution
C)Plasma shielding effects are minimized
D)Ablation threshold fluence decreases linearly

💡 Explanation

Tightly focused beams cause high photon densities, increasing the probability of multiphoton ionization because several photons can simultaneously excite electrons beyond the ionization potential of orbital energy levels. Therefore, ionization increases rather than thermal or shielding changes under these pulse conditions.

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