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← ScienceWhich limitation arises when increasing laser coherence length?
A)Speckle contrast becomes more severe✓
B)Total output power sharply decreases
C)Spatial mode profile deteriorates rapidly
D)Temporal pulse width stretches greatly
💡 Explanation
Speckle patterns become prominent with increased coherence because constructive and destructive interference is enhanced, resulting in higher contrast; therefore, speckle is the limitation, rather than power loss or mode deterioration which are separate effects.
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