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Which mechanism disrupts spectral purity after laser welding?

A)Stimulated Brillouin Scattering
B)Plasma Emission Broadening
C)Rayleigh scattering
D)Mode Hopping

💡 Explanation

Stimulated Brillouin Scattering (SBS) affects coherence; the original beam generates an acoustic wave, scattering light with a frequency shift. The coherence degrades because the reflected beam interferes, therefore increased noise occurs, rather than through plasma effects under stable parameters.

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