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Which effect diminishes when a pulsed laser operating near its bandwidth limit loses spatial coherence?

A)Beam divergence increases markedly
B)Pulse duration shortens significantly
C)Peak power rises substantially
D)Spectral bandwidth nears zero

💡 Explanation

Increased laser beam divergence occurs upon loss of spatial coherence due to phase variations across the beam. Because constructive interference is reduced, therefore the collimation worsens, rather than resulting in the other properties, since these effects require high coherence.

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