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← ScienceWhich risk increases when a semiconductor laser forward current decreases?
A)Gain medium thermal stabilization fails
B)Emitted photon energy band widens
C)Spontaneous emission dominates lasing✓
D)Fermi level approaches conduction band
💡 Explanation
Spontaneous emission dominates lasing because decreased current reduces the electron-hole recombination rate; therefore, stimulated emission is less likely to be triggered, and spontaneous emission dominates, rather than laser action occurring, at design efficiency.
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