As far as I understand, when forward biased voltage applied, electrons from N diffuse to P, then recombine. Since energy gap between conductive electron and hole is const => only certain wavelength photons is emitted.
In gaseous lasers for example you need to gain a populational inversion, which requires to have a certain energy levels, including one of them to be metastable.
How the stimulated emission works for laser diodes?
In gaseous lasers for example you need to gain a populational inversion, which requires to have a certain energy levels, including one of them to be metastable.
How the stimulated emission works for laser diodes?
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