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Which mode lasing increases when pulsed laser's resonator shortens?

A)Longitudinal mode frequency separation
B)Thermal lensing within gain medium
C)Transverse mode spatial overlap
D)Stimulated emission cross section

💡 Explanation

Shorter resonator length will increase longitudinal mode frequency separation because the longitudinal modes are determined by the cavity length and Fabry-Pérot effect. Larger separation occurs, therefore higher frequency modes lase rather than lower frequency modes dominating due to gain bandwidth.

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