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Which consequence results when coherence length decreases in lasers?

A)Spectral linewidth increases significantly
B)Peak power output increases
C)Directionality becomes more focused
D)Efficiency reaches a maximum point

💡 Explanation

Shorter coherence length implies a broader range of frequencies; the mechanism is temporal coherence. Because a wide spread of frequencies corresponds to a large spectral linewidth, temporal coherence drops; therefore, high beam intensities drop, rather than increasing directionality.

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