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← ScienceWhich diffraction pattern blurs within laser micromachining due to speckle?
A)Reduced laser beam coherence length✓
B)Increased focal spot ellipticity
C)Enhanced spatial frequency doubling
D)Greater pulse duration broadening
💡 Explanation
Reduced coherence length decreases interference stability between reflections which causes beam speckle within ablated material; therefore, blurring increases because shorter coherence times limit precise laser control rather than stable frequency conversion/focus.
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