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← ScienceWhich mechanism causes mode-locking within a pulsed laser?
A)Interference of longitudinal cavity modes✓
B)Spontaneous emission dominates gain
C)Relaxation oscillations in the laser medium
D)Optical pumping rate exceeds threshold
💡 Explanation
Mode-locking occurs due to the interference of longitudinal cavity modes with fixed phase relationships, because this constructive interference generates short, intense pulses. Therefore, pulsed operation results, rather than continuous wave, because phase coherence is enforced actively.
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