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← ScienceWhich outcome occurs when coating thickness varies on optics used inside a pulse laser amplifier where temporal coherence is desired?
A)Pulse broadens; gain narrows
B)Amplifier's output spectral purity degrades✓
C)Spatial mode instability increases
D)Thermal lensing effects decrease rapidly
💡 Explanation
Amplifier spectral purity degrades due to interference, because varying coating thicknesses induce phase shifts that affect temporal coherence via modified pathlength. Therefore, spectral purity decreases, rather than other performance metrics reducing uniformly with coherence loss alone.
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