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← ScienceWhich risk increases when partially-coherent laser beams are multiplexed?
A)Speckle contrast becomes strongly amplified✓
B)Chromatic aberration significantly worsens
C)Polarization drift induces mode mixing
D)Stimulated Raman scattering efficiency vanishes
💡 Explanation
Speckle contrast increases due to constructive and destructive interference patterns from residual path length differences; the **mutual coherence function** is degraded, therefore speckle becomes prominent, rather than even intensity and avoiding that uneven laser effect.
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