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← ScienceWhich consequence results when spatial coherence degrades laser cutting?
A)Kerf width increases drastically✓
B)Material melting point decreases
C)Assist gas pressure drops
D)Beam polarization becomes circular
💡 Explanation
Spatial coherence ensures a focused spot; laser cutting leverages coherence for energy density. Loss of coherence causes beam divergence due to diffraction, rather than direct melting behavior; thus, kerf width increases because the energy spreads, therefore reducing cutting precision.
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