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← ScienceWhich outcome results when a quantum well laser's active region is excessively narrowed?
A)Increased threshold current density occurs✓
B)Spontaneous emission rate decreases
C)Wavelength of light emission shifts red
D)Optical gain spectrum broadens significantly
💡 Explanation
Increased threshold current density occurs because quantum confinement strengthens, therefore enhancing the electron-hole overlap due to the Wave Function Squeezing Effect. This necessitates more carriers to reach population inversion, rather than lasing at lower current densities with fewer trapped carriers.
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