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Which mechanism limits micromachining resolution when using femtosecond laser ablation?

A)Heat Affected Zone (HAZ) formation
B)Self-Phase Modulation (SPM) broadening
C)Stimulated Raman Scattering (SRS)
D)Two-Photon Absorption (TPA) saturation

💡 Explanation

Heat Affected Zone formation limits precision, because energy spreads via thermal diffusion rather than being strictly confined to the focused laser spot. Therefore, feature resolution decreases, rather than non-linear effects limiting material removal.

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