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Which propagation outcome during pulsed laser deposition causes non-uniform thin films?

A)Specular reflection dominates on the substrate
B)Diffraction limits the plume's spatial coherence
C)Thomson scattering reduces ion kinetic energy
D)Plasma frequency influences the group velocity

💡 Explanation

Diffraction inherently limits the plume's spatial coherence because Huygens' Principle dictates the expanding plasma acts as a collection of secondary emitters; therefore, diffraction results in angular spread causing film non-uniformity rather than uniform deposition.

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