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← ScienceWhich outcome occurs when a mode-locked laser's cavity length changes?
A)Pulse duration broadens, peak power decreases✓
B)Wavelength shifts towards the blue spectrum
C)Destructive interference boosts specific frequencies
D)Coherence length increases exponentially thereafter
💡 Explanation
Pulse duration broadens since mode-locking stability depends on precise cavity resonance leading to constructive interference. Group velocity dispersion causes temporal stretching that broadens the pulse durations; therefore, laser peak output is attenuated rather than increasing coherence.
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