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← ScienceWhich risk increases when a pulsed laser weakens coherence?
A)Speckle formation is more significant
B)Power fluctuations increase near threshold✓
C)Average beam divergence will decrease
D)Absorption rates inside cavities will oscillate
💡 Explanation
Sustained coherence concentrates energy within a precise bandwidth; pulsed weakening alters temporal pulse shape because amplified spontaneous emission broadens the spectral bandwidth, therefore power instability becomes more apparent near the lasing threshold rather than mode-locked operation.
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