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← ScienceWhich consequence results when coherence length decreases in laser machining?
A)Increased surface roughness✓
B)Improved material oxidation
C)Reduced heat affected zone
D)Enhanced cutting speeds
💡 Explanation
Reduced coherence length means less predictable interference. Ablation becomes uneven because energy deposition varies spatially due to speckle from decreased uniformity of coherent beam overlap; therefore surface roughness increases, rather than achieving controlled material removal.
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