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← ScienceWhich consequence results when longitudinal modes lose phase-locking in pulsed lasers?
A)Decreased pulse duration (temporal coherence)
B)Increased average output power (amplitude)
C)Elevated spatial coherence (focus spot)
D)Reduced peak power (deconstructive interference)✓
💡 Explanation
Reduced peak power outputs because phase locking maintains constructive interference. Loss of phase relationship incurs destructive interference via mode beating, therefore the average power spreads out, reducing peak intensity, rather than shortening the pulse itself or other coherence enhancements.
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