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Which consequence results when coherence decays within a laser?

A)Speckle pattern becomes more diffuse
B)Cavity temperature gradients will decrease
C)Gain medium lasing threshold is reduced
D)Average output power abruptly increases

💡 Explanation

A loss-of-coherence event affects wavefront synchronization via increased phase differences. That causes the speckle pattern to become more diffused because decreased coherence results in less constructive interference, therefore it diffuses, rather than showing stronger pattern visibility.

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