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← ScienceIn a gallium arsenide semiconductor laser, which outcome limits photon emission wavelength?
A)Crystal lattice energy band gap✓
B)Debye length carrier diffusion
C)Surface recombination velocity increase
D)Photon momentum phase mismatch
💡 Explanation
The stimulated emission requires photons exceeding the crystal’s energy band gap; because photons with less energy cannot excite electrons, population inversion fails. Therefore, the band gap limits laser’s maximum effective emission wavelength, rather than minority carrier recombination effects.
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