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← ScienceWhich consequence manifests when laser facet AR coatings fail?
A)Increased stimulated emission threshold✓
B)Reduced photon confinement efficiency
C)Fabry-Perot resonance disruption
D)Enhanced external quantum efficiency
💡 Explanation
An AR coating failure causes increased reflectivity at the laser facet, thus optical gain must increase to overcome losses. This raises the stimulated emission threshold because of enhanced reflectivity, rather than reduced resonance; these occur under different operational failures.
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