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← ScienceWhich outcome occurs when an optical cavity lengthens slightly in a laser?
A)Reduced optical power output✓
B)Increased mode-locking efficiency
C)Narrower linewidth of emitted light
D)Suppression of stimulated emission
💡 Explanation
A slightly lengthened optical cavity disrupts constructive interference via Longitudinal Mode Competition, because different modes now require different cavity lengths to lase. Therefore, optical power decreases, rather than narrowing the bandwidth or enhancing efficiency, given the limited gain medium bandwidth.
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