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← ScienceWhich phenomenon reduces efficiency when injecting incoherent light?
A)Speckle pattern destructive interference
B)Increased spatial mode mismatch✓
C)Reduced pump-signal coherence
D)Greater stimulated Brillouin scattering
💡 Explanation
Spatial mode mismatch increases because of poor coherence. The injected light will not optimally couple to the gain medium, therefore, less pump energy contributes to amplification, rather than the concentration of light necessary for efficiency.
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