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← ScienceWhich outcome results when a semiconductor laser's energy band alignment degrades in pulsed operation?
A)Increased threshold current density✓
B)Enhanced optical mode confinement
C)Improved carrier injection efficiency
D)Decreased heat dissipation in facet
💡 Explanation
Increased density occurs because band alignment degradation changes the gain spectrum, causing increased threshold current density rather than improved lasing efficiency; this is due to reduced stimulated emissions, therefore shifting operation requirements beyond expectations rather than facilitating efficiency improvements.
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